Abbie and I have developed an unofficial tradition of rushing through summer separately, and then tubing together during her last week of vacation as a spur of the moment last hoo-rah before she goes back to school.
The first year we did this we were still kids, and one of my brothers joined us. We ended up getting in trouble with my mom for misjudging the time it took us to float down river and meet her so that my brother could be picked up for his guitar lesson. In an effort to recover lost time and rendezvous with her, we paddled to the nearest shallow patch of water on the PA side of the Delaware, then proceeded to scramble barefoot up a sketchy poison ivy covered river bank, and sneak through someone's yard till we reached the road.
Fortunately we've learned to be more time-conscious since then, and I've perfected the art of judging the time it'll take to float almost anywhere in our section of the river. Moral of the story: carefree meshes with responsibility.
(Also, have relatives with riverfront property so you don't have to trespass...)