If you have money to spend here are some ideas:multicopters flight in field of vision or FPVRC cars, there may be some RC race tracks around big citiesif you have some sea or lake nearby, windsurfing might be good ideaphotographyMore cheap ones find some hackerspace or maker groups, they usually understand that someone needs less social interaction, and you can learn to build stuffbird watchingingress mobile game (or any other made by niantic)
Idgaf - i don't give a fuck, I'm me