Being from Canada, we always exchange for Pesos before we head down, as the exchange rate is much more favorable while at home. The current exchange rate is around $1 CAD= 12.25 MXP
Obviously, The staff will take any form of currency they are offered (why wouldn't they ?),but most of them only truly understand the relative value of USD and MX/Pesos.
If you are from the USA, just leave your money alone, but if you are from outside the USA I suggest that you convert directly into pesos (NOT USD) before you head to Desire. This avoids the staffs local bank from making $$ on yet another conversion as they trade it back for pesos.
Another added Bonus is that MXP paper money is waterproof !! This has proven VERY handy for me when the shorts fall in the pool
Steve
PS - For anyone wanting to know the current core exchange rate of their local currency check
www.XE.com