If you want to party but don't want to deal with people messing up your common spaces/bathrooms, I would go with wellness. I lived on wellness last year and will do so again next year. Almost all of my friends live on wellness and, believe me, people party, people drink, but it will not be tolerated on the floor/hall. Wellness isn't necessarily quiet, but I've never had trouble sleeping. It'll be louder in Jewett than other dorms because there are common rooms and people like to hang out in them, whereas in other dorms most socialization will go on in the rooms so there's less noise in their wellness, I hear.
But don't request wellness if you want to party in your room. If you want to go out to party, that's one thing, but the wellness culture is not chill with people boozing it up (loudly) in their rooms. Your roommate will probably be pretty 'conservative,' as you put it, but not necessarily. Mine liked to party way more than I did.
Do not request quiet. From what I know, it's a tiny hall in Raymond, one of the most rundown dorms on campus, and the bathrooms are utterly terrifying. Wellness gives you more options for dorms, and you're more likely to be put in a nicer dorm because the recently renovated dorms have more wellness, in general.