what to do outside

it's a beautiful day and I want to do something outside because i love the outdoors but im also a bit overweight... any physical activity is needed. i don't really have anyone to hang out with right now except for my little brother, who's glued to his computer. im considering going for a bike ride but it's always ruined because i get self conscious of how stupid helmets look and how no one my age wears them.

what do you guys do?