Jooo, here is the plan - wich is not yet really a plan.
Go for 4 weeks in July and August with 2 water loving and diving kids to Mexico. But not for the resorts and the luxury.
Traveling where it is safe, have the sea close by, see some pyramids and a bit jungle - but more relaxing close to the beach.
Let‘s have a call the next days. Might be more easy.
Yes, let me know when you are free :)