Ian's river cave trip is incredible. It's an Indiana Jones experience, I have no idea how many people I have had on that trip, at least 75 and got rave reviews. Have also been on it several times myself. A must is hiking boots, must have good tread to climb.
The Radisson is nice, did major renovations the last few years, I like Fort Street, it is more quaint. I haven't seen The Great House but hear it is wonderful, but pricier than Fort Street. The Colton House is cute too.