We like the Southpoint or Turtle Pond area.
The area near the HH is a bit too busy and loud for us. We were there one summer and they had this "beach party" thing every day at the main pool, with a DJ and music and all sorts of carrying on.
Southpoint has a quiet pool and a bus stop. Turtle Pond has a quiet poll with a snack bar and a bus stop. Every bus that leaves OKW stops at the HH last, so if you wanted to get there and didn't want to walk, you could hop on any bus. I usually ask the driver when I get on if he/she will be stopping at the HH, just to make sure.
I don't really think there is a building that is much more than a leisurely 10-15 minute walk from the HH, no matter where you are located.