I didn't have many GPs before (only Parenting and Spa Day), but since I loved the Spa Day refresh, I decided to get more of them during the Holiday Sale (OK all of the ones I was missing except Batuu; hey, it was a good sale). I hope they will refresh all of them eventually. But I'd mostly like OR refresh with more activities, Granite Falls turned into residential world and more fun activities for the vacationeers. I'd especially love an added ability to own one of the rental houses and either use it as vacation/2nd home or rent it out to other sims "AirBnB style" – then you'd have to come there after them and clean up, or pay a maid to do it for you.
As for Parenthood, I'd take a refresh, but I don't feel like this pack needs it as much. As Parenthood is one of the best GPs imho. But I would like all of the things you list, but then I think it would classify as an EP instead of GP.