I wish all inclusive resorts were more common in the US. I love cruises but they are SO bad for the environment. We are floating a whole hotel across the sea for very little reason. What I really love about them is like 80% just the all inclusive resort parts. Put that resort near a cool hiking mountain or other fun stuff and my "excursions" for the day will be just as fun, and I don't have to kill the environment to get there!
Oh bonus idea: either all inclusive "resort" train, or connect these resorts via train for the adventure aspect.
I used to hate the idea of full board hotels in Spain, there was nothing more boring than staying in the same place for more than a few days, but now I have 3 kids, I love the idea of someone else cooking, cleaning, and serving me cheap drinks. Best bit, is when the kids ask me to play with them, I can actually say yes!