diff --git a/include/kami/grid.h b/include/kami/grid.h
index e820a06..aacc964 100644
--- a/include/kami/grid.h
+++ b/include/kami/grid.h
@@ -131,7 +131,7 @@ namespace kami {
          *
          * @returns the distance as a `double`
          */
-        virtual std::optional<double> distance(std::shared_ptr<Coord> &p, GridDistanceType distance_type) const = 0;
+        virtual double distance(std::shared_ptr<Coord> &p) const = 0;
 
     };
 
diff --git a/include/kami/grid1d.h b/include/kami/grid1d.h
index b7755a9..b205704 100644
--- a/include/kami/grid1d.h
+++ b/include/kami/grid1d.h
@@ -80,12 +80,10 @@ namespace kami {
          * and toroidal wrapping of the underlying `Grid1D`.
          *
          * @param p the point to measure the distance to
-         * @param distance_type specify the distance type
          *
          * @returns the distance as a `double`
          */
-        std::optional<double>
-        distance(std::shared_ptr<Coord> &p, [[maybe_unused]] GridDistanceType distance_type) const override;
+        double distance(std::shared_ptr<Coord> &p) const override;
 
         /**
          * @brief Test if two coordinates are equal
@@ -118,7 +116,7 @@ namespace kami {
          * @details If any component of the resulting value is not a whole number, it is
          * truncated following the same rules as `int`.
          */
-        inline friend GridCoord1D operator*(const GridCoord1D &lhs, const double rhs);
+        inline friend GridCoord1D operator*(const GridCoord1D &lhs, double rhs);
 
         /**
          * @brief Multiply a coordinate by a scalar
@@ -126,7 +124,7 @@ namespace kami {
          * @details If any component of the resulting value is not a whole number, it is
          * truncated following the same rules as `int`.
          */
-        inline friend GridCoord1D operator*(const double lhs, const GridCoord1D &rhs);
+        inline friend GridCoord1D operator*(double lhs, const GridCoord1D &rhs);
 
     private:
         int _x_coord;
diff --git a/include/kami/grid2d.h b/include/kami/grid2d.h
index 6414db5..cc0981f 100644
--- a/include/kami/grid2d.h
+++ b/include/kami/grid2d.h
@@ -72,6 +72,23 @@ namespace kami {
          */
         [[nodiscard]] std::string to_string() const override;
 
+        /**
+         * @brief Find the distance between two points
+         *
+         * @details Find the distance between two points using the
+         * specified metric.
+         *
+         * However, the coordinate class is not aware of the
+         * properties of the `Grid2D` it is operating on.  Accordingly,
+         * if the direct path is measured, without accounting for
+         * and toroidal wrapping of the underlying `Grid2D`.
+         *
+         * @param p the point to measure the distance to
+         *
+         * @returns the distance as a `double`
+         */
+        double distance(std::shared_ptr<Coord> &p) const override;
+
         /**
          * @brief Find the distance between two points
          *
@@ -89,7 +106,8 @@ namespace kami {
          *
          * @returns the distance as a `double`
          */
-        std::optional<double> distance(std::shared_ptr<Coord> &p, GridDistanceType distance_type) const override;
+        double
+        distance(std::shared_ptr<GridCoord2D> &p, GridDistanceType distance_type = GridDistanceType::Euclidean) const;
 
         /**
          * @brief Test if two coordinates are equal
@@ -243,14 +261,14 @@ namespace kami {
          */
         [[nodiscard]] bool is_location_valid(const GridCoord2D& coord) const;
 
-        /**
+        virtual /**
          * @brief Get the location of the specified agent.
          *
          * @param[in] agent_id the `AgentID` of the agent in question.
          *
          * @return the location of the specified `Agent`
          */
-        [[nodiscard]] std::optional<GridCoord2D> get_location_by_agent(const AgentID &agent_id) const;
+        std::optional<GridCoord2D> get_location_by_agent(const AgentID &agent_id) const;
 
         /**
          * @brief Get the contents of the specified location.
@@ -279,7 +297,7 @@ namespace kami {
          */
         [[nodiscard]] bool get_wrap_y() const;
 
-        /**
+        virtual /**
          * @brief Return the neighborhood of the specified Agent
          *
          * @param[in] agent_id the `AgentID` of the agent in question.
@@ -292,7 +310,7 @@ namespace kami {
          *
          * @see `NeighborhoodType`
          */
-        [[nodiscard]] std::optional<std::shared_ptr<std::unordered_set<GridCoord2D>>>
+        std::optional<std::shared_ptr<std::unordered_set<GridCoord2D>>>
         get_neighborhood(AgentID agent_id, bool include_center, GridNeighborhoodType neighborhood_type) const;
 
         /**
diff --git a/src/libkami/grid1d.cc b/src/libkami/grid1d.cc
index 84ebedd..d885aaf 100644
--- a/src/libkami/grid1d.cc
+++ b/src/libkami/grid1d.cc
@@ -47,10 +47,7 @@ namespace kami {
         return std::string("(" + std::to_string(_x_coord) + ")");
     }
 
-    std::optional<double>
-    GridCoord1D::distance(std::shared_ptr<Coord> &p, [[maybe_unused]] GridDistanceType distance_type) const {
-        // We are going to ignore distance type since they all
-        // have the same result in one dimension.
+    double GridCoord1D::distance(std::shared_ptr<Coord> &p) const {
         auto p1d = std::static_pointer_cast<GridCoord1D>(p);
         return static_cast<double>(abs(_x_coord - p1d->_x_coord));
     }
diff --git a/src/libkami/grid2d.cc b/src/libkami/grid2d.cc
index a764a31..c15e68b 100644
--- a/src/libkami/grid2d.cc
+++ b/src/libkami/grid2d.cc
@@ -48,7 +48,12 @@ namespace kami {
         return std::string("(" + std::to_string(_x_coord) + ", " + std::to_string(_y_coord) + ")");
     }
 
-    std::optional<double> GridCoord2D::distance(std::shared_ptr<Coord> &p, GridDistanceType distance_type) const {
+    double GridCoord2D::distance(std::shared_ptr<Coord> &p) const {
+        auto p2d = std::static_pointer_cast<GridCoord2D>(p);
+        return distance(p2d);
+    }
+
+    double GridCoord2D::distance(std::shared_ptr<GridCoord2D> &p, GridDistanceType distance_type) const {
         auto p2d = std::static_pointer_cast<GridCoord2D>(p);
 
         switch (distance_type) {
@@ -57,9 +62,9 @@ namespace kami {
             case GridDistanceType::Manhattan:
                 return distance_manhattan(p2d);
             case GridDistanceType::Euclidean:
+            default:
                 return distance_euclidean(p2d);
         }
-        return std::nullopt;
     }
 
     bool operator==(const GridCoord2D &lhs, const GridCoord2D &rhs) {