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This GPS Guided RC Boat project is a great way to capture some interesting pre-determined navigation scenes. The boat does a great job of navigating until it hits something or gets swamped. Joseph Fortune has a page that provides build details and code so you can make your own.
 “Here is a rough layout of the parts. The 9V battery hooked to the engine was actually one of those 7V rechargeable RC battery packs. The other 9V battery was to give the Arduino its own noise-free power source (Noise from the engines kept resetting the Arduino). Here I used the Adafruit GPS breakout board, when the project actually used the GPS shield, but they didn’t have the graphic. Other than that, this should be pretty faithful to the actual design.”