Do not use a credit card, use pesos, not another currency.
I use 100 peso bills as they can't switch the bills for smaller ones (or be very careful)
Assuming from the Tulum town/pueblo
Akumal or Xcacel Beach - yes (5-10 minute walk from hwy to the beach)
Coba: No - a taxi or ADO bus
Plala P beach (Tulum) -...
ADO bus is 198 pesos pp (adult)
Canada Transfers - say $120 US round trip total
Or ADO bus to PDC (250 pesos each) + 350 peso taxi ride to PA)
Total - 750 pesos
Taxi back to the airport - ...
here is a great entertainment guide
We always try to visit Batey's
Read the last 5+ pages of thread...
The actual map is
here is a map / article of snorkeling
Please ask at the beginning of your vacation
I concur with CoPilot's recommendations
its called a Sian Kaan eco tour - see them in the wild
If you want to go into the water and PET them, ride on their fins and tails, then thats the cruel part
The ocean current (see windguru) should change by Thursday (back to NE)