I longboard whenever it’s not snowing or raining. That’s the inexpensive street version of snowboarding I suppose, which is my other hobby, strictly practiced in the winter. Both are very healthy and sharpen your senses. I normally live around mountains or flat lands, so I don’t get to surf much, but I try to whenever I visit a beach town. That’s like the water version of snowboarding.
I play drums too (rock drumming on a drum kit). It can be good cardio, so it’s quite healthy too. This hobby requires living somewhere where noise is not an issue and you’re willing to shell out $400+ for a drum kit.