The best time to go is between Oct-March because it is not so hot and humid.Between April-Sept there is a risk of hurricane and rain.I found the weather perfect when i went,not too hot,just right and not humid in the evenings.
Fondest memory: Tulum is soo beautiful,you have to see it to believe it.I just stood there for about five minutes speechless at its beauty.
Little mayan archeological ruins at 119 kms from Cancun. These ruins are unique, as they are at the sea shore, in a small beach facing the sea. They were not inhabited, but used for sacrificial purposes. The main building is called 'The Castle'. You can't miss it, is the tallest tower.
visit Tulum, 2hrs south of Cancun. While in Tulum, you must visit the Castillo ruins at the top of the cliff overlooking the Carribean sea. Try to schedule a massage at Maya Tulum or attend one of their yoga classes. Be sure to carry mosquito spray repellent with you. I was eaten alive by mosquitos and came home with lots of bites marks. Not attractive.
Fondest memory: My fondest memory in Tulum was visting Piedra Escondida restaurant one evening for drink at the bar. The ambience was hip, almost cafe del marish. The guests were few because of low season and Richard (Kiko), the 33 year old Italian hotel owner taught me how to play backgammon. Later in the evening, his Italian compatriots came over to the restaurant and joined us for dinner, drinks and a few rounds of backgammon.
Since I was a female traveling alone, I made acquaintances with these male Italian expats. (There is quite a large Italian colony in Tulum.) They took me in as a friend and treated me very kindly.
Go to some of the Mayan ruins (Chichen Itza, Tulum, etc.) and/or some of the ecological parks (Xcaret). Chichen Itza is about 2 1/2 hours from Cancun and is in the center of the forest, so expect some heat. I went to Tulum (which is on the coast) and loved it. Our tour guide was a professor in a Mexican University and was very knowledgeable about the Maya and their culture. Below is a picture from Tulum.
Fondest memory: The water! Cancun/Cozumel have some of the warmest and clearest ocean water I have come across. Tons of marine life. Also, I miss the free flowing tequila!