how do you lose weight in the summer?

ok, i have a problem with my weight. im not OVERweight but i just want to get skinnier, i got some chub from winter haha. i was wondering how i can lose weight in the summer? what i’ve been doing is riding bike everyday, going swimming, and becoming a vegeterian also. any other ideas? i just want to try something new for a while. any suggestions?
oh! i also run around town with my friends whenever i dont want my bike. i’ve also been playing sports *basketball* with them…. its excersize soo im happy