Between dealing with Segways, yellow minigolf carts, and giant red buses, it's easy to get tired of tours without even actually going on one. But not all tours have forgotten the locals. ThinkWalks, led by Joel Pomerantz, is the best one for those who want to learn about the city's natural and historical past. Tours cover topics from public art to geography to politics, and take place all over our 49 square miles, from the Water Walking Tour to the Outside Lands Bike Cruise. Check out the calendar for tour dates and pay, after the journey ends, on the sliding scale of how much money you're raking in these days ($10-$40).