Spent two post-cruise nights at Renaissance La Concha in early January. I liked the hotel. All three restaurants had very good food. The concierge lounge was also nice. We were upgraded to an executive suite with a nice view of the main pool and the Condado. Didn't use the beach but it looked decent.
I would imagine the Ritz to be nicer but I found the La Concha was quite nice and reasonably priced, especially compared to a typical Ritz.