The day after visiting Labna and Xlapak, we visited the Loltun Caves.  The Loltun Caves are on the Puuc Route several miles past Labna.  They are magnificent, very spacious and gentle.  They are one of the few caves that I have entered where I did not feel like I was being compressed.  I visited these caves last year, but my photos did not turn out well.  These caves feel great.  I highly recommend visiting them if you are in the area.