While I couldn't afford to stay at the Opryland Resort, I did get to visit the Hotel Gardens while in Nashville. The gardens are stunning, and I couldn't get over how big the place was. I believe I read that the Gardens are 9 acres and have over 50,000 plants!
There are 3 main areas of the Gardens: Cascades, Delta, and Garden Conservatory. Cascades has an amazing 44-foot waterfall, Delta has it's own river & riverboat cruises, and the Garden Conservatory is beautiful as well. There are shops and restaurants throughout, and the temperature is very comfortable (felt like it was in the high 60's).
This hotel reminded me of something you would see in one of the "super-hotels" in Las Vegas. Nashville should be proud to have such a wonderful & unique property.
Tip: Park at Opry Mills Mall at the north end of the lot and walk to the Gardens to save $21 in parking fees.