I've been to the Pollanesion hotel too! It's absolutely amazing. We were only there for 4 days, and only left the hotel two of the days to explore the rest of the Dells! It was a great time even just staying at the hotel!!
Mount Olympus. I think that's how it's spelled. They have the main resort with the hotel on site and the they have more of their hotels a few blocks down, which are smaller but really nice. cheap too.