Hola Amigos!!
Iīve just come back from Riviera Maya! Mexican Caribbean, a great place, great sea, in spite of the Sargazo seaweeds also beatches are nice.
Just check how is the weather and the seaside into your hotel, if the sea doesnīt look like the Caribbean sea, than go to Isla Mujeres or Cozumel, which are free from Sargazo.
Besides the seaside you can visit Mayan ruins, Tulum was one of the best place I visited, even though Chichez Itza was impressive too.
And what about Cenotes?? the famous underground rivers??they are just amazing. Ask for Cenotes tours and be sure to visit opened Cenotes, which are the best and the most stunning.
Donīt miss scuba diving there, reefs are a great world to explore.
Try a fresch Coconut with chile and lime and drink lots of Tequila, Margaridas and Piņa colada.
Have a great time in Riviera Maya amigoooo!!!