There's something to be said for getting away without the kids. But that serene vibe you seek can totally be ruined by the presence of other guests' children. So if you're looking for a relaxing getaway -- whether a romantic rendezvous or a girls' weekend -- here are the top 10 adults-only hotels in the U.S. No need to worry about splashing in the pool or wailing babies in the restaurant at these 10 beautiful resorts.