I like your ideas. :) I do think the lake should be made swimmable if at all possible, and I'd love a few extra activities (playground stuff, ziplines and/or rope bridges, cutting wood and more woodcutting projects).
I don't know how feasible it is, but being able to visit (or even live in) that world could be nice, now that we can simply make rental lots, and making the bugs (maybe just the more common ones and at a lower rate?) spawn in other worlds could help the pack feel less isolated.
Two very important things to me that would largely be building on currently existing features would be to make group walks possible in that world (maybe adding some kind of geo-caching element or using a compass and various other items) and adding more herbalism recipes, some of which could be tied to other pack features. I'd love to see things like homemade sunscreen, recipes that make it easier to befriend animals, special fertilizer for plants, homemade medicine to cure illnesses from Get to Work and so on. I do like the idea of the anti-aging cream too. I'd like herbalism to be more useful when away from the Outdoor Retreat world.
