Hi Patricia!
Splash Mountain is one of the most popular attractions at Disney's Magic Kingdom park. The Song of the South and Br'er Rabbit's adventures with Br'er Bear and Br'er Fox are the theme for this classic log flume ride. My son Tech and I enjoyed Splash Mountain near midnight on our last vacation to Walt Disney World Resort and it was a BLAST! And take my word for it, YOU WILL get soaking wet!
I'm tall and have long legs, but I was completely comfortable in the log-styled seat. We sat in the front and I could both stretch my legs out and bend my knees no problem. Truthfully I was more worried about the dips and turns throughout the ride...there are a few surprises!
With bad knees, be aware you'll need to step into the log, which can be a bit wobbly so you may need assistance getting your bearings.
Splash Mountain is a definite must do Disney attraction! Be sure to put on your best face for the big 5-story drop in the end, it will be captured by the attraction camera.
Wishing you a magical and memorable Disney vacation!
~Juliette