okay good, fuck greek life lol. it's like what you've seen but way more gross. the squaw/alpine pass wouldn't be bad, though I'd personally probably go with the tahoe local college pass from vail, as it's around the same price for way more skiing. it's honestly whatever if you don't visit before you come. I was in the same boat as you, I didn't see reno or the campus until I was up here for freshman orientation and I liked it just fine.
as far as finding a roommate, they'll assign you a random one (or more, depending on the dorms you stay in) unless you specifically ask otherwise. I ended up rooming with someone from my high school, so that's how I got my roommate. if you really don't want a random roommate, and there is someone you don't hate from your HS then you could request them as a roommate.
as far as the dorms go, I'd recommend argenta or peavine. both are 3 to a room instead of 2, but you get your own bathroom and they have AC and heat, and are all around newer. idk what they are calling the new dorm, but I'm sure that wouldn't be a bad place to stay once they get it built, if it's even done by next year. the LLC isn't terrible either. basically it's 3 rooms linked to one hallway with a bathroom and sink and some closet space, with 2 people in each room. my cousin and his friends are in the LLC right now and they seem to like it. I'm pretty sure all the dorms are around the same price anyways. the meal plan is what's gonna be pricier. I'd take a look at those and decide how much you really eat as far as the price goes.
I haven't fly fished since I've been in reno, but I'm sure there is some decent stuff in the truckee river/lakes around here. a quick google search on it looked pretty promising, and I've definitely seen people out fly fishing and stuff around tahoe/truckee. it wouldn't be a bad place to fly fish by any means.
UNR's pre med is pretty good as far as I understand, and you'll definitely have some work cut out for you. college chemistry and biology are no joke, so you'll have to be able to balance school work with your free time. you should still have plenty of time to ski on the weekends, though.
will you have a car? cus having a car in reno is a definite benefit.