The Boulevard Pool is one of three pools at The Cosmopolitan, the other two being the Bamboo Pool and the Marquee Day Club Pool. The hotel checks for room keys for entry into the pool level. It is open 7 days, 8 am to 8 pm.
The layout: The Boulevard Pool consists of the main pool, a small wading pool, and a small heated pool. The main pool slopes gradually from very shallow (2" deep) water to deeper water (~4-1/2'). It is surrounded by padded lounge chairs and a few cabanas. On higher surrounding decks and by the wading pool, there are additional lounge chairs. A small recreation area is adorned with a wall of TV screens, some chairs, and two pool tables. Nearby is the Overlook Grill. Medium-loud Top 40 style music sets the ambiance. For a hotel this size, it's a rather small pool.
The view: The pool is on the east end of the hotel, overlooking The Strip. When you're in the water, mostly you are looking at Paris, Planet Hollywood, the giant LCD screen running Cosmopolitan ads, and the East Tower of The Cosmopolitan.
Laying out in the sun: At noon on a Thursday in June, the pool wasn't that busy, though all of the lounge chairs by the main pool were already taken/saved. A number of lounge chairs were still free by the wading pool and on the upper decks. (The chairs are already looking worn, and many have cigarette burns.) There is plenty of sun in the morning, but by 3 pm, both pools are substantially shaded. If you are looking for sun at that time, try the Bamboo Pool.
The service: Since it was a chill weekday when I arrived, I didn't have too much trouble ordering a drink from one of the roaming servers. There is a limited menu of drinks and appetizers left by the lounge chairs, but a full bar is available. Cocktails (~6 oz) are $15 plus tax & tip.