-Go out to some national park area or at least a pretty expansive park between noon and 3 PM or so (lots of trees is preferred, but open green fields are a must, even better if the terrain has a few mild hills -- if there's a warm breeze too, you have your perfect setting). Take off your shirt, and run back and forth across the field. You will feel great! Climb a tree for good measure (but don't hurt yourself -- use a sober spotter, of course).
-Using a sober spotter (of course), take a swim in the shallow end of the pool. If the water is pretty warm, it'll feel incredible.
-I don't advise this at all in terms of safety, but riding a bike is damn near exhilarating, provided that you're on a relatively mild dose, coming down, or haven't come up entirely yet. The peak would probably make me crash, and most likely you too.
-I have to agree with the guy who talks about missions, because these missions are the best part of rolling, in my humble opinion. Even something as uninteresting as walking down a few blocks to the market to get drinks and rolling supplies can seem like the trip of a lifetime. In one situation, me and a few friends were given the task, a few years back, to distribute flyers in Hollywood for a band we were buddies with. We parked in Hollywood, took a pill each, and proceeded to work. It was one of the best days of our lives! It was a relatively cool day (overcast), and we kept hydrated. For me, and my friends, we all have a decent amount of energy with MDMA alone, so lots of walking and such never tires us out. In fact, it's preferrable to sitting on our asses and watching lightshows.