Stone skipping is the purest small-but-fun there is: it's free, it needs nothing but a flat stone and calm water, and a good skip is oddly, deeply satisfying.

There's more technique than you'd think — stone choice, spin, angle, and release all matter — so it rewards a little practice without ever being a commitment.

The honest reality is you need access to still water and you'll throw a lot of plonkers, but that's half the relaxing fun.