There are two pools at the Sports. One outside Stadium Hall, near Surf's Up buildings and one past the Touchdown buildings, in front of the Home Run buildings.
Do take the time to look at the resort map and get your bearings when going to and from Stadium Hall. It can be a little confusing some times. My DH usually relies on me to make sure we are going in the right direction. LOL
They might even think about purchasing refillable mugs, $11.99. They can be used for the entire trip at the resort for Sodas, hot choc, tea (Iced & Hot), & coffee. You can go get drinks at the drink station as long as the food court is open.
Also be aware that the food courts can get very busy as times. If they have never been to the All Stars at all, then one thing that will help them is that the food courts, you get your meals at the different stations and then pay for everything at one time before you go sit down. If they are going to get the mugs, they purchased them either with their first meal in the food court or prior if they are going to use them before that. After they purchase the mugs, they don't pay for drinks unless it is orange juice, milk or water and anything that is in the cooler in the food court area. Anything that they can get at the drink station is free.
We, personally like the Sports, where alot of people prefer Music or Movies. The buses are great. For Early Entry (EMH), they usually have less waiting time between buses for the park that is having EMH.
Hope they enjoy their trip.