Hi L.!
My husband & I honeymooned in Maya Riviera (Tulum) years ago. While all in all we had a great time I did learn some very important things. DO NOT DRINK THE WATER!!! Keep in mind, all food on a buffet table has probably been there for a while...AND the weather is VERY HOT. I drank the water, ate fish off of the buffet, & boy did I get sick!!! Food poisoning is not fun! Also, once you're trip is paid for NO MATTER WHAT, do not give the resort a credit card number for anything! I gave them my CC for mishaps & they ASSURED me it would not be charged. I did not sign anything. We got home & our paid in advance vacation had been double charged. We lost $3500+. Fought it but it being a different country we didn't get anywhere. As far as clothes, pack light & airy everything! I packed Ohio clothes. It was so HOT, my husband bought me a dress from the market & I wore that every single day! Pack heavy sunscreen & aloe vera in case someone gets sunburned. I can not stress this enough, the sun is a lot hotter there, so you may want to take a big hat for your son. Don't get me wrong here, Mexico is so much fun, & we were there in October. I would go back any day! I'm sure you & your family will have a great time! I hope this helps some. If you take anything from this, please take the water & the buffet advise! Best of luck to you! S.