just cuz you don't smoke doesn't mean you have to be sober brah

I could write you a long list of alternatives if you like. (some legal ones too)
sober people activities I enjoy:
listening to music
cooking is nice sometimes
learning an instrument
trying to find a way to make $$$
if you are quitting something it's a great time to make some changes. do some exercise (it will help reinforce quitting and make you feel better quicker), find some new hobbies, meet some new people or learn something.
you don't need weed to enjoy things but it's quite likely you will be quite apathetic and bored for a while after quitting, good luck man it's not easy.