We like our swimming pools on two levels, thank you. The pool at the Westin Diplomat features a top level, with water spilling over the sides (travel agents call this an "infinity edge"), a submarine porthole with a swimmer's-eye view of the lower level, and more than 100 feet of glassy-surfaced water, which is a lap-swimmer's dream. Then there's the bottom, which crosses underneath the infinity pool and is more than twice as long. The spillover from above feeds a pair of head-rattling waterfalls, and you can look up through that porthole to see swimmers ogling you from above. The hotel still hasn't taken our advice and connected the two levels with a spiraling water slide (you have to use a landlocked stairway to go from one level to another). But the total effect is still mind-blowing. One big drawback: You have to be a guest at the hotel to use the pool. We like to get Mom and Dad to stay there when they visit, so we can claim a name and room number when we ask for one of those fluffy towels they hand out.