What to do in summer?

Over the years it feels like my creativity has waned and I often find myself bored. I try to think of stuff to do but I rarely ever come up with something except like parkour and soccer, and unfortunately my friends seem to have a dearth of creativity as well. Thus we're often stuck in the same old repetitive "circle". Alright, could someone help out by brainstorming and sharing some creative new exciting things to do during summer. Other seasons would be neat too ^^ if it helps I'm 16.