diff --git a/TouchyTickets/ParkMap.cs b/TouchyTickets/ParkMap.cs
index 196c398..e3dcb4f 100644
--- a/TouchyTickets/ParkMap.cs
+++ b/TouchyTickets/ParkMap.cs
@@ -43,12 +43,13 @@ namespace TouchyTickets {
             var random = new Random();
             for (var x = -AdditionalRadius; x < this.Width + AdditionalRadius; x++) {
                 for (var y = -AdditionalRadius; y < this.Height + AdditionalRadius; y++) {
-                    if (x >= 0 && y >= 0 && x < this.Width && y < this.Height)
+                    var pos = new Point(x, y);
+                    if (this.IsInBounds(pos))
                         continue;
                     if (random.Next(15) != 0)
                         continue;
                     var type = random.Next(3);
-                    this.treePositions[new Point(x, y)] = type;
+                    this.treePositions[pos] = type;
                 }
             }
 
@@ -91,7 +92,7 @@ namespace TouchyTickets {
                         var nextPos = (camera.ToWorldPos(drag.Position + drag.Delta) / Attraction.TileSize).ToPoint();
                         // drag the center of the attraction
                         nextPos -= new Point(this.PlacingAttraction.Type.Width / 2, this.PlacingAttraction.Type.Height / 2);
-                        if (this.PlacingAttraction.Type.GetCoveredTiles().Select(p => nextPos + p).All(p => p.X >= 0 && p.Y >= 0 && p.X < this.Width && p.Y < this.Height))
+                        if (this.PlacingAttraction.Type.GetCoveredTiles().Select(p => nextPos + p).All(this.IsInBounds))
                             this.PlacingPosition = nextPos;
                     } else {
                         // move the camera
@@ -171,6 +172,8 @@ namespace TouchyTickets {
         }
 
         public bool CanPlace(Point position, Attraction attraction) {
+            if (!this.IsInBounds(position))
+                return false;
             foreach (var offset in attraction.Type.GetCoveredTiles()) {
                 if (this.GetAttractionAt(position + offset) != null)
                     return false;
@@ -195,9 +198,7 @@ namespace TouchyTickets {
         }
 
         public Attraction GetAttractionAt(Point position) {
-            if (position.X < 0 || position.Y < 0 || position.X >= this.Width || position.Y >= this.Height)
-                return null;
-            return this.attractionGrid[position.X, position.Y];
+            return !this.IsInBounds(position) ? null : this.attractionGrid[position.X, position.Y];
         }
 
         public int GetAttractionAmount(AttractionType type) {
@@ -212,10 +213,16 @@ namespace TouchyTickets {
             return this.attractions.Any(a => modifier.IsAffected(a.Item2));
         }
 
+        public bool IsInBounds(Point pos) {
+            return pos.X >= 0 && pos.Y >= 0 && pos.X < this.Width && pos.Y < this.Height;
+        }
+
         public ParkMap Copy(int? newWidth = null, int? newHeight = null) {
             var newMap = new ParkMap(newWidth ?? this.Width, newHeight ?? this.Height);
-            foreach (var (pos, attraction) in this.attractions)
-                newMap.Place(pos, attraction);
+            foreach (var (pos, attraction) in this.attractions) {
+                if (newMap.CanPlace(pos, attraction))
+                    newMap.Place(pos, attraction);
+            }
             return newMap;
         }