You are an DM and have 1000 dives. That’s great. Why have you decided to go to Mexico to dive a Cenote? Heard great things about them? They are a magical place. Do you dive backmount singles? Doubles? Sidemount? Are you wanting some guided tours? If you want a first class shop - then I recommended Protec Tulum or Protec Playa or a private instructor? PM me and I will give my best recommendation for what you really want.