iOS/Android: We could all stand to get up and walk a bit more. WunderWalk creates a path based on activities or interests that you're looking for (e.g., museums), hungry for (e.g., burgers), thirsty for (e.g., coffee), or shopping for (e.g., clothes).
The app plans out the most time-efficient path according to proximity and ends close to your starting point, which is a useful automatic calculation. It also shows you a phone number for each location and connects with Foursquare to show you more information.
Ideally, the user would also be able to specify the amount of free time they had, or the distance they'd be interested in travelling. WunderWalk works best in urban environments, so folks living in quieter suburbs may have to use a more densely populated location as a starting point for walks.