Best surprisingly clean river trip
Bronx River Alliance 
Strap the family into their life jackets and get psyched to slide down a sheer rock wall, paddle through a rarely seen part of the borough's botanical garden and hike around urban waterfalls. Yep, you're still in the Bronx. The nonprofit organization's eight-mile-long canoe and kayak trips aren't for wusses—your kids are pretty much guaranteed to get splashed—but they're safe. Outings run May through October; most are pay-what-you-wish.