I really like all of your ideas, but to add some of my own...
Lake Life EP - A world centered around lakeside activities. Like Sulani, there could be lots built over water allowing us to build docks. I could see mortar boats, tubing, dive platforms, volleyball, canoes, paddle boards, and slides being added. Maybe they could even add a Sasquatch wandering about.
Superheroes GP - This would add new super abilities that could either be earned or inherited as well as a superhero and supervillain active career. I'd love it if they'd reintroduce the martial arts skill here as well, with your sim's skill level determining how likely they are to win a fight. This might also be a good pack to patch in cat burglars.
Renaissance Fair GP - Possibly a destination world, your sims would dress up and partake in fun activities like archery, fencing, pottery, lute playing, or blacksmithing. Of course you could then purchase the equipment to bring home and continue playing with. Perhaps your sim might even be crowned Queen or King for a day.
Daycare SP - New infant and toddler stuff as well as a system that allows you to turn your home into a daycare.
Game Room SP - The hero object could be a pool table with a nice assortment of furniture and decor appropriate for a game room.