I also stayed the Andaz for 4 nights in January 2014. No one was there and we felt like each guest could claim and entire pool or beach for themselves. We took Relaxation Beach and were the only ones there for two consecutive days. The water is perfect and pretty bouyant (moreso than San Diego or Hawaii) --- I just floated on my back with my waterproof ipod for hours.
TIP: During daylight hours there is a free shuttle around the Peninusula. We took it to the Four Seasons one day and spent about 4 hours there. The hotel was much busier had a nice swimming beach with waves. As the Four Seasons is pretty remote everyone assumes your are a guest there while visiting so they offer you the free treats by the pool and beach (i.e., frozen fruit bars) and you can use the loungers.
While the Four Seasons was nice, I thought the Andaz was better. The pools are definitely better at the Andaz.