Yeah, Mountain Vista has elevators. The Falls does not.
If you could luck out and can get Big Cedar Wilderness Club, the Lodge buildings have elevators. Although it is not in town, it would be my first choice regardless of what you enjoy doing. It has an indoor pool in the clubhouse. It is just an exceptional place and the grounds (many, many acres on both sides of Big Cedar Cove) are absolutely gorgeous in their Christmas finery. You don't even have to leave to sight-see. (Wow, I sound like someone else.
)
In town I think you would also like Palace View by Spinnaker, French Quarter, Cabins at Green Mountain, Worldmark (request a ground floor unit), and Cedar Ridge. Stonebridge is very upscale and Holiday Hills is nice, but the added benefit of them is their golf courses, which you don't do. Point Royale has a golf course, but units there can be iffy. It is a sprawling, full-ownership community with different styles of accomodations, ranging up to houses.
IMHO,the other places can be iffy too.
On the lake your best bets with an 80-year old with difficulty getting around would be Still Waters, Emerald Pointe and Branson Yacht Club.
Based on what I am seeing, if I were coming to stay here the week starting November 4th, and going only by resort, not unit size, here is my pecking order:
Grandvista Emerald Pointe
Branson Yacht Club at Rock Lane/Escapes! to Branson Yacht Club
Fairfield Branson
Palace View by Spinnaker
Silverleaf's Holiday Hills
Escapes! to Stonebridge Village
Grandvista's Branson Woods
French Quarter
Silverleaf's Ozark Mountain Resort
Sunterra Resorts The Plantation
Surrey Vacation Resort
The Falls Village
Surrey Vacation Resort/Carriage
Roark Vacation Resort
Royal Aloha Vacation Club
After French Quarter, it's all kinda a toss-up only I never have cared for Roark or Royal Aloha. But, even Roark has it's benefit now. It is located at the intersection of Branson Landing Drive, so is the only timeshare located near Branson Landing, the very nice new development in downtown Branson, on lake Taneycomo. You could easily make a nice vacation out of a week on Taneycomo, Branson Landing and downtown.