We had 3 wonderful days at the CESIAK/Boca Paila Camps lodge with our 2 year old daugther. the location is simply amazing out on a narrow strip between the stunning Tulum-style beach (turquoise shades of blue, white sand, etc.) and a large lagoon. Not too far from Tulum. the rooms are actually tents on platform with palapa roof, and we really loved them. the view over the beach and ocean is simply breathtaking.
However you need to be a bit a camping-style kind of person. you have sharted bathrooms and toilets and they were in our case quite a walk away from the rooms and in our case also the same toilets as for the restaurant (a bit public feeling if you just want to take a shower in the evening). Room service etc is ok, but rather on the modest side. As they say, they are MAINLY an ecological centre, and only in second importance a lodge.
We loved the SianKaa all day tour so much, really knowledgable guide and boat captain, beautiful tour with focus on ecosystem understanding, floating in the river, visiting maya ruins, etc. A bit costly but since all profits go into conservation and eco training projects every dollar spent there actually feels good. and the tour was worth the money anyway. restaurant was good. Off season price was really ok (70$ or so per night) through locogringo.com but booking directly through them would also work fine.