Hi Charity,
Being an exchanger, you will have the least priority for the best areas unfortunately. But I suggest u still fill out the online Diamond Lane form.
With that being said, most prefer the newest Cascades. They are the most modern villas because they were the most recently built. There are some sections at Vistana that were built in 1980 and earlier. Cascades buildings, as well as the next newest section (Lakes) are the only buildings that have elevators.
There are 7 other sections. The Fountains II is next newest after the Lakes, followed in order of newer to older :
Fountains I, Springs, Palms, Spas, Falls, Courts.
The resort is sort of split in two. The Lakes/Fountains I & II are in one area, while all the other sections are in the other area. The sections are separated by small roads/security gates/walls or fences. On the Lakes/Fountains side is the restaurant, Flamingo Cafe. There are two pools on that side.
On the other side, you have the restaurant, Zimmies, as well as the Cascades Bar and Grill and the General Store. There is a Pizza Hut in the General Store. All of these eateries offer room service to your villa, regardless of which section you're in. There 5 additional pools on the Cascades side.
Charity, since you're checking in on a Friday, you most likely will NOT be placed in either the Courts or Falls (and this is a good thing). But anywhere else is up for grabs. The oldest section you could be put in would be the Spas.
Hope this helps and have a nice stay.