Just got back from SERC last night. *sigh* First time in Mexico AND first AI experience, but I've been to a few non-AI 4-5* resorts - Radisson in Aruba, El Conquistador in Puerto Rico, and Our Lucaya (the higher end side) in Freeport. We were really impressed with SERC in so many ways - the service, the food, the drinks, the pools, the spa, the room, etc. The one downside is the ocean water - it is actually a nice color, but the sea grass makes it less appealing to swim in. But the beach itself is very nice, and you can indeed take long walks to either side. What I really liked the most about SERC is how spread out it is - so even though it is a big resort, it never feels crowded. I mean never. You can always find a pool or a spot on the beach that is super quiet. We liked the far south end of the beach, NEVER gets crowded, and William from the Sugar Reef bar is great, he will bring you drinks and food continually with a smile
. Also liked the spa pool and the U-shaped pool near buildings 8&9 - they are NEVER crowded, and super quiet. And we never waited for dinner (including Bordeaux @7:30pm). The only time we saw lots of people in one place was in the theater, and in the swim-up bar pool (the only crowded pool). Overall the most relaxing place we've ever been, would go back in a heartbeat.