That would depend on how big the adult is. My DH is 6'1" and his feet hung off the end, but width wise it was fine. Then again, his feet hang off the queen beds they have at the lodge.
Bunk beds are located in both the woods view and courtyard view rooms. They are scattered through the resort, so you can have the view you are looking for, if the room is available when you check in. There are MANY, MANY bunk bed rooms available so it won't hinder your chance. Sometimes I think there are too many. Don't worry.
Faxing would be fine, but make sure you also put your requests on your reservation by calling CRO. The room assigners are there to make magic happen if they could so they will try to do their best. I do know that they look at the reservation's requests when they are downloaded to the resort.

Again, don't worry. If you don't get the view you want, ask again when you get to check in.