The grounds are nice, we went when it was raining, so didn't do much of the walk. You don't really get the view of the panorama around the house from the visitor center, you need to take the house tour.

I would allow at least an hour to linger at some of the sculptures and also enjoy the view at the top. You can take the walk uphill or down or both, or take the shuttle one way. The Visitor's Centre has a map you can borrow that has information on all the art.

Hi : The ticket price is $25.-. That gives you a bus ride from the parking lot/ office/ tourist trap to the house, the guided tour and either the nature walk of the property or a ride back. We had an early morning "in depth" tour of Fallingwater that allowed us to walk the trails around Fw, visit the Ohiopyle park, have lunch in town, stop at Cucumber Falls and go on the Kentuck Knob tour.

We took the in-depth tour and thoroughly enjoyed. I don't recall the difference in cost but we certainly appreciated the extra time in the house, which gave us more time to ask questions and linger in the rooms a bit more. We did go downstairs, saw a bit more art, and wandered around the outside with our tour guide. Do NOT miss a walk out to the "knob", so allow plenty of time on the grounds.

Yes, Fallingwater will take you 2-3 hours depending on the tour you take. We did the morning in depth tour and took us 2 1/2. Kentuck Knob is short drive from Fallingwater and takes about an hour to tour. If you want to the time to view the grounds leave another 30 minutes aside. It's a nice relaxing day!