The crew wants me to organize the next trip & I know from past experience that booking a resort with Sister resort privileges is a smart idea. Thinking of staying in Playa Del Carmen at the Allegro Playacar, where we could do one day trip to the Cancun Hotel Zone, then another easy day trip to Cozumel. If I book the Allegro, I think I can use the Allegro Cozumel, but can I use the Occidental Tucancun in the Hotel Zone? (Occidental & Allegro are owned by the same company) Anybody know?