Not during meal times, I'd say the food court, inside or out. When the weather is good, along the lake where there are benches with garbage cans next to them. (Some people go there to smoke, but most of the time it's quiet.) Although I don't know how good the wifi is by the lake.
Meal times means something like:
8am to 1030am
8pm to 1030 pm.
Lunch time is always quiet.
Where it isn't quiet:
The lobby -- there are always a ton of people, even in the middle of the night.
The main pool and quiet pools
(I've been to other hotels such as Beach Club or Caribbean Beach where the quiet pool is very quiet, but Pop isn't one of them.)
I forgot to mention: All pool areas are quiet when they are closed. Pools are normally open from 9am to 11 p.m. You can sit by the pool at night after it closes. In the morning, they do cleaning so you won't be able to sit there during cleaning, but the rest of the time should be fine. Pool areas have good wifi. Also in the morning, even after the pool opens, it's quiet for about an hour until enough people come to swim.