Wander Wheel Hands You An Itinerary, Tells You To Be Spontaneous

Wander Wheel takes you on a goal-based adventure that breaks up your everyday routine and expands your horizons. Wander Wheel sets you up with an itinerary that's tailored to you, handing you a specific goal to accomplish. You can discover new things in your own back yard or in the city's most popular locations, when traveling.

This sounds like a very interesting app if you're feeling a bit spontaneous.