Hmm I may not be the best for budgeting topics as I tend to blow a bit past what I allow myself to spend.
Five nights is a lot but if you're flying I think it's worth it. Flight will cost the same whether it's one day or ten, so you might as well get plenty of nights out of the trip.
With regards to this $1000 - is this $1000 after hotel and flight? If not, then you aren't going to have much leftover.
Assuming this $1k is after hotel/flight though, then I'll be honest, you might want to try bumping it up depending on what you want to do. I'm like you in that I don't want to get shitfaced anymore, but drinks are still gonna run you at least $10 at most places if you aren't gambling. Just to keep a buzz going, you're probably going to have ~3-4 drinks a day as you'll be wandering around and find yourself wanting to sip on something, so I'd write off at least $100 to booze/hydration.
Food will probably be your biggest expense unless you plan on gambling a bunch. When you go to a place like vegas, you aren't going to want to spend your money on shit you can get back home like mcdonalds or chik-fil-a. I mean okay there is an exception for the taco bell cantina, but that's probably the only time I'd spend money on fast food on the strip. But the point is, you're going to want to try places that are different, but those places are going to run your bill up a bit.
You can forget that $10 figure per drink too if you plan on going to a club. ONE will run you $25+.
I guess as for everything else non-food related, what else are you wanting to do? Shows are moderately expensive but worth it in most cases. Nightclubs are expensive but can be fun as hell if that's your scene. Gambling is its own topic but if you don't do it then you can make for 1k go a lot farther.
I've been several times and am actually going back this weekend. I'm no expert but I feel experienced enough to be able to share ground level basic tips for vegas strip stuff.
Hotel and flight are already paid for. I dont plan on gambling much if at all. The only upside of gambling in Vegas is that drinks are free if thats even still a thing.
I plan to hit clubs one or two nights then the rest Ill just do whatever. My girlfriends is also coming. Weve got tickets to Americas Got Talent but other than that Im kind of going blind.
The food Im not so worried about. I could eat Chipotle everyday if it means I get to do more actual fun shit. I have no interest in going to expensive restaurants just to say Ive been.
I also have no shame about pregaming at the hotel. My girlfriend and I already talked about buying a bottle at a liquor store and just getting a decent buzz going before going out so we dont spend an arm and a leg.