Harrah’s Casino, located in Valley Center and surrounded by a mountainous backdrop, offers the Rolls-Royce of pools. Dive, the resort’s main pool, is for guests ages 21 and up. It features a swim-up bar, hot tubs, cabanas, palapas, and firepits, often with live music. If you are interested in a kid-friendly option, Harrah’s Lazy River is open to youngsters and includes two waterfalls. You must be a hotel guest to swim in pools.