Part of the delight of the Vegas resort complexes is the gorgeous pools -- what could be better for beating the summer heat? But there are pools and there are pools, so you'll need to keep several things in mind when searching for the right one for you.
During the winter, it's often too cold or windy to do much lounging, and even if the weather is amenable, the hotels often close part of their pool areas during winter and early spring. The pools also are not heated for the most part, but in fairness, they largely don't need to be.
Most hotel pools are shallow, chest-high at best, only about 3 feet deep in many spots (the hotels want you gambling, not swimming). Diving is impossible -- not that a single pool allows it anyway.
And finally, during those hot days, be warned that sitting by pools next to heavily windowed buildings such as The Mirage and TI-Treasure Island allows you to experience the same thing a bug does under a magnifying glass with a sun ray directed on it. Regardless of time of year, be sure to slather on the sunscreen; there's a reason you see so many unhappy lobster-red people roaming the streets. Many pool areas don't offer much in the way of shade. On the other hand, if your tan line is important to you, head for Caesars, Mandalay Bay, Wynn Las Vegas, or Stratosphere (to name a few), all of which have topless sunbathing areas where you can toast even more flesh than at the other hotels.
At any of the pools, you can rent cabanas (which often include TVs, special lounge chairs, and even better poolside service), but these should be reserved as far in advance as possible, and with the exception of the Four Seasons' complimentary shaded lounging area, most cost a hefty fee. If you are staying at a chain hotel, you will most likely find an average pool, but if you want to spend some time at a better one, be aware that most of the casino-hotel pool attendants will ask to see your room key. If they are busy, you might be able to sneak in, or at least blend in with a group ahead of you.
