My 16 year old brother would go to the pool alone, one day while my mother and I went to Animal Kingdom, he went to Hollywood Studios & Disney Quest alone. He is responsible and trustworthy enough (albeit, he is a boy, so I know you have extra concerns about leaving your girls alone).
I think the pool is fine, there are two pools, and there are tons of things to do at the big pool. Every day they have things like a movie at 8pm, Bingo at 2pm, a dance contest, etc. so there is plenty for them to do and plenty of supervision.
As for Downtown Disney, I wouldn't see a problem with leaving them at the hotel, provided they had something to do like watch a movie. Although, there's so much to do in the world, I could see them wanting to leave to do something else. I think you should bring them to DTD with you. Disney Quest is open until midnight I believe, so they would at least have that to do. They can also go catch a movie while you have quality time with DH!
I think the pool is fine, there are two pools, and there are tons of things to do at the big pool. Every day they have things like a movie at 8pm, Bingo at 2pm, a dance contest, etc. so there is plenty for them to do and plenty of supervision.
As for Downtown Disney, I wouldn't see a problem with leaving them at the hotel, provided they had something to do like watch a movie. Although, there's so much to do in the world, I could see them wanting to leave to do something else. I think you should bring them to DTD with you. Disney Quest is open until midnight I believe, so they would at least have that to do. They can also go catch a movie while you have quality time with DH!

) for a couple of hours. But again it all depends on the child.
