There are a lot of interesting suggestions here! Some look a little ambitious, but it never hurts to throw ideas out there.
Personnally, here are the things I'd want :
Cross-pack functionality for the herbalism skill : Allow us to make sunscreen to prevent sunburn with Seasons, and make new recipes or update current ones so they can help with the creatures in Jungle Adventures and Snowy Escape, for instance.
Updated world : I'd love for the world to be livable, now that we can put rental lots anywhere, and if it's possible, to make the lake swimmable (maybe with the addition of canoes or kayaks?).
Extra activities, though those would likely require new animations (some more complex than others, in these suggestions). It could be things like archery, axe-throwing, "obstacle courses" (crawling under nets, climbing a more natural-looking wall, stepping on logs, swinging from a rope into water or some such) (this one might also fit in a Strangerville update, considering the military career), whittling (new woodworking items including some wooden toys and the ability to make some of the smaller items without the woodworking station). A new wind instrument would be amazing (harmonica or recorder). I'd like a portable telescope added.
Extra build-buy assets (the pack was kind of light on those, and more furniture to build and furnish cool-looking log cabins would be awesome.
