Birthday weekend in Vegas- where to stay?

Hotels with good Pool Parties:

MGM Grand Las Vegas (Wet Republic Ultra Pool)

Cosmopolitan Resort & Casino (Marquee Nightclub & Dayclub)

Encore at Wynn Las Vegas (Encore Beach Club)

Mandalay Bay Resort and Casino (Daylight Beach Club)

Those hotels also happen to have some of the best nightclubs currently in Vegas (Actually the top 3 in my opinion) which are Hakkasan Las Vegas Restaurant and Nightclub (MGM), Marquee Nightclub(Cosmopolitan), and XS Nightclub (Encore). I don't think Light Nightclub, Mandalay Bay at Mandalay Bay is as good as the other three but it is by not bad either. Probably still in the top five.

The hotels mentioned all have great restaurants as well.

Mandalay and MGM will probably have the best prices on rooms. I tell people to use hotelscombined.com for the best room rates as it is like kayak.com on steroids. If it is a big fight/concert weekend at the MGM or Mandalay Bay, you MAY get a better rate at the Cosmopolitan or Wynn but even then, they will usually cost a bit more.

The MAJOR dilemma you will run into is that almost EVERYWHERE will be "expensive" relative to normal rates. Even the 2nd rate hotels like the Flamingo, etc. will be pricey. You are coming on one of the most expensive weekends of the year.

If you can, I would try to come two weeks before if possible as the weekend immediately before a big holiday like labor day is usually kind of slow. The good news is that there are great prices those weekends though.

It is really about what matters more to you. A crazy party or price. Generally you will get what you pay for here.

Wynn Hotel Las Vegas or Encore at Wynn Las Vegas!!! The best with pool parties on weekends.

I like Thomas's answer. I think he's got it covered. One thing to have a look at is www.TheSuitest.com. They find killer deals on suites and it works great for Vegas. Have fun!

MGM Grand Las Vegas has Wet Republic Ultra Pool Party.  MGM can have relatively reasonable rates. Large hotel with plenty to do right on site and it's right on the strip.  If your looking for hotel details try www.smartervegas.com.  I usually find pretty decent rates for Vegas hotels with their collection of promo codes.  

Paris Las Vegas. It's less than $200/night right now for Labor Day weekend (Fri-Mon is $169/night) It's right in the middle of the strip so easy access to lots of other hotels and casinos. Not sure about the daytime pool parties, but from the looks of it, the pool has a view of the Eiffel Tower. :)

Check out Rumor Boutique Resort, Artisan Hotel Boutique or the El Cortez Cabana Suites. Cheaper rates and the rooms are really cute! Have fun!

Excalibur/Luxor Hotel and Casino are the cheapest on the strip. You won't be in your room much so don't worry too much about quality of the room! As for ones with stuff going on, Mandalay Bay Resort and Casino and MGM Grand Las Vegas are relatively inexpensive and have suites and good pool parties/clubs!

If you really want to be cheap - The Quad Resort & Casino is your best bet. It's right in middle of the strip and everything is right around it. 

If you can splurge just a little more - Go for ARIA Resort & Casino or MGM Grand Las Vegas. 

MGM has amazing food, mall and best hotel in that side of the strip. It probably has the largest rooms for money spent. 

Aria - It's the HOTEL everyone wants to go to. It's very close to Bellagio Hotel

Your best bet is to start researching the various LV Blvd strip hotels. Prices really vary greatly from day to day and property to property. Also if an event, such as a big fight or concert or even certain conventions, is in town, that can drive rates up.