SideStep today launched Activity Search Beta which offers comprehensive, real time search for local entertainment in categories such as Museums, Sports, Outdoor & Adventure, Amusement & Theme Park, and Dining. The service also offers powerful filtering options such as duration (3 Hour tour or all day tour?), city (Visiting NYC? You might want to see Stamford, CT), and day (Rest the first couple days and then choose an Segway tour for the third day of your trip).
This service isnt just for someone planning a vacation, but also for anyone who wants to book an activity in his or her local area. SideSteps Activity Search would actually be a very strong stand alone offering, but has even more potential when integrated into flight and hotel searches.
Read my full introduction to SideStep Activity Search.