There are actually two walking paths at SF--one is very short (like 10 minutes) and the other is very long (like 30 minutes) and will take you all the way to Aventura and Cabana Bay!! We made that mistake one night and I pulled my achilles tendon from the hike

Oops. Good thing our trip was almost over at that point.
Someone mentioned thin walls a page or two ago, and I can confirm now that the walls are pretty thin. I was in the bathroom one evening and could hear a child in the shower of the room next to me. He really wanted his mom to just get him a washcloth! We also heard kids running up and down the hallways a lot and got woken up around 6:30 AM on our checkout morning from the other room next door getting their suitcases out of their room.
Oh, and I murdered the alarm clock one morning because a previous guest had set the alarm clock for 6 AM and didn't undo it before they checked out! I couldn't figure out how to make it stop so I just unplugged all the wires, bahahaha.
It was a lovely room and resort, though!
We were a little confused about the level of service, too. We usually stay at Portofino Bay, so we were really surprised when the staff at Sapphire Falls insisted on carrying our luggage for us when we checked in and out (you seemingly have to let them do this, even though we were happy to just cart our stuff ourselves). It all seemed very high class, which we weren't expecting from this resort when we never had that kind of treatment at PB, ha!