Hi Sabrina and the rest of the Now Jade Brides ! I can remember doing the Bus Stop with a bride not long ago on the Terrace, lots of room. You can see more of our work at the Now Jade If you have any other question, we are happy to help.
Oi MaiBrasil Lorena and I were just in Panama and it is a wonderful location, we can recommend www.peppophotography.com He is a local Panamanian who has been in the business for years. He speaks English and I am sure would be a great help to you. Welcome to the forum.
There are many vendors here in the Riviera Maya doing video of a very high quality. Please have a look through the Vendor section of the site http://www.bestdestinationwedding.com/products/category/photographer-videographer
If it happened to rain, I think you can be ok with the inside part of the restaurant there. Perhaps a little small for a large group but diner could be saved with the covering. Kool Beach is one of our favorite reception venues. They let people let loose ! Lets not forget this is the venue that hosts one of the largest electronic dance partys in North America ! BPM Festival ! Ou last wedding there had no rain but the wedding party HAD SOOOOO Much fun they all got wet anyways !