Bellagio is the place you're going to find 10/20 or higher. Depending on how much you want to center your trip on poker, staying at or near the Bellagio is a good idea. Personally, I like the Monte Carlo as a cheap place to stay. You can find online deals at one of the Vegas Discount Code sites, and might be able to stay for around $60/night. Sadly, all of the strip casinos have stupid "resort fee" things, so what you think is going to be a $29 or $39/night room will be $20 more. Monte Carlo shares a tram stop with Aria, and you're a short ride from the B. You can look at a strip map for other properties near the B, I'm sure someone can recommend ones that aren't terrible -- depends on how you feel about walking. The B 4/8 game has a half kill. If you end up at MC, there should be a 4/8 and like a 2-6 spread limit game going most of the time.
The other alternative is just to suck it up, stay at Bellagio, and play 6(?) hours a day to get the poker rate. Book your room through the poker room, so call their number, ask for poker, and say you want a player's rate. They'll track your hours, and you're on the hook for the regular rates if you don't play enough (could be >$300/night). Should be something like $129 on weeknights and $169 on weekends. Maybe a little more and don't forget the stupid resort fee. If you're concerned about busting your trip roll and having to do something dumb like short stack 1/2NL to nit fold for hours to get room rate, find someplace near the B with cheaper rates. If you care about convenience, stay at the B.
Don't believe there are any all-inclusives. If you want to go cheap, there are a few food courts (Monte Carlo, outside the quad, and others?). I'd do breakfast and/or lunch at like a McD's or Chipoltle and then spend real money for dinner, to do cheap. You may also have hourly credits from the poker room from your player's card. I usually hit a grocery on the way to the strip (if I've bummed a ride or have a rental) and keep some breakfast stuff + Gatorade in the room. That said, don't get a car unless you're doing real touristy stuff out of town.
Can't really help with night life. If you're going to strip clubs, there is some way to get a ride and avoid a cover, I think. Not sure. Bet someone can tell you the lifehack. Learn what getting long hauled is on the cab ride from the airport, and if your taxi does it, how to get that trip for free. JoeTall and HammerinHank are the two ninja taxi users that I know -- if someone tells you that they're doing something Joe told you to do, it is expert.
If you're really doing tourist stuff, there used to be a Las Vegas city pass. It included free admission a bunch of places and my wife loved it. We also did
Alibi, the live mystery show and enjoyed it (you end up walking all over down town, so if you don't like walking...). We always enjoy Penn and Teller. Lots of other good shows, depending on what you like.
Tip $1 on any pot that like has a flop bet called. Talk to people like they're humans. Feel free to read the dealer's badge and greet them by name. You'll do fine.
I'm sure others will have good suggestions.