take a cab to puerto juarez hop on the ferry to isla mujures and hit the north end of town were all the souviner shops are every other shop has a weed or hash dealer in it there is also a good doc feel good on the island it's a nice day trip and the people and bars on the island are great if you insist on bringing your own then take a baggie place weed inside wrap with duct tape place in another baggie wrap with tape repeat once more then take a bottle of shampoo and empty in to container place weed in shampoo bottle pour shampoo back into bottle replace cap and put the shampoo in your shower kit place shower kit in CHECKED luggage not carry on enjoy your trip