Let me begin by saying "You are going to LOVE the cabins at FW"!!!!!!!!!!!!
This is the only place I can get my kids to talk about staying at when we visit WDW. They love everything about FW. My kids are -- DD/11, DS/5 and DD/3.
There is just so much to do. We almost always rent a golf cart for out transportation but we have occassionally used the buses. Never had a problem. The bus drivers have always been willing to answer our questions if we were not sure which bus to use.
Your kids are older than mine, but I truly believe they will enjoy everything FW offers. There are basketball courses, tennis courses, 2 pools, an area to play volleyball, bike/hiking trails, boating and so much more.
There is also an arcade at Trail's End. We like to watch the MK fireworks from the beach, stop by the Tavern and order a carryout pizza and play in the arcade while waiting on the pizza.
As for a particular loop to stay on---they are all pretty much convenient to the bus stops. It wouldn't hurt though to ask for a cabin near the beginning or near the end of the loop. That way you will not have much of a walk to the bus stops.
One other suggestion--we always like to eat breakfast in the cabin most mornings. I usually get up earlier than everyone else, so I fix breakfast. While everyone eats, I get ready and then the bathroom is free for the person who finishes eating first and so on.
I hope this helps and that your family has a magical vacation!!!!!!!!
