There's nothing I dislike about the beach, but I find that vacationing there for extended periods gets old, very fast. I don't need to sit and stare at water to have fun. ...I mean, I've been spoiled by some beautiful, solitary ocean-front natural properties, so I guess it doesn't do much for me anywhere else.
I like exploring diverse places and cultures. It's definitely more stressful, and can be mentally draining, but I find that is all part of it.
Food is a big part of traveling for me, and since I don't really like seafood that much, I have much less use for beaches. And even if I did care about seafood....it's not like the food at fancy beach destinations is going to be uniquely special compared to most others. It's about the same everywhere you go. (I'm not considering Asia here, because all bets are off. They will eat their own toes if it looks interesting enough)
Depends where I go and why I'm going. I enjoy crabbing, digging for clams and mussels, catching scallops and conchs, picking up oysters, hunting for octopus and lobsters, catching fish, etc. There's so much to do or not to do. It's your choice. Some people like to watch the birds and watch the pelicans dive for fish. Or you can surf, paddle board, swim, snorkel, scuba, etc. Anywhere you go, it's what you make of it. Doesn't matter if you go to the mountains, lake, city, etc. Your attitude determines whether you have fun or not. It's why it's so important to travel with compatible partner or just go by yourself. There's nothing worse than traveling with Debbie Downer. They can turn any trip miserable.
When I'm in Asia, I love getting up early and going to the wholesale fish market and watching all the crazy action. It's amazing to watch the auctions and fishmongers at work. Or catching a fishing boat that's coming in and buying their catch of the day from them before they sell it to the wholesalers.
For this Cancun trip, I don't have any plans other than to relax at the resort and spoil my wife. She can get her favorite spa and massage treatments. I will take her shopping at Hermes in Cancun and let her buy whatever she wants. Eat empanadas, Caesar salad, and grilled octopus at Puerto Madero like we do on every Cancun trip. Order room service and eat and drink at poolside and on the beach. Doing absolutely nothing but spending time with my wife and thanking her for sharing 20 years of her life with me.