Without a doubt, do the trip to Coba- it was amazing! We did Tulum, but were far less impressed as it was much more touristy and 'hands off'. Xel- Ha was great as well, I had never snorkelled until we went there, but it was impossible not to be drawn by the fish. Mexico is such a wonderful place, so much to see and do- whatever you opt for you will have a brilliant holiday!
Pam
