As others have posted:
AKL or YC/BC
Stayed at AKL on one of those stays that I wanted to spend alot of time at the resort. It was absolutely wonderful. It was so relaxing. The pool has a zero entry just like that of the Poly. There are two hot tubs outside with views of the animals close by. It is just a wonderful place. There is so much to see and explore right there at the resort, you don't really need to leave. The food is great. There is a storyteller around the firepit, tours of the lobby, artifacts everywhere! It is great. You can spend a day just looking out the window at the animals, or sit and read on your balcony. I would request a savannah view. We had one, and I loved waking to giraffs outside the window. It is amazing! I can't say enough about this resort. It is underrated, IMO.
I have never stayed at the YC/BC, but stay across the lake at BWV. It seems that the pool alone is the main attraction there. You certainly could spend a lot of time there. Also, with the Boardwalk across the way, there would be lots to do. Only thing is that I find the hustle and bustle of the BW area and its resorts not as relaxing as the AKL would be. I often feel I need a vacation from my vacation when I leave there. However, things like miniature golf and lots of restaurants are only a short walk away.