I found the park to be very interesting. The inclined railroad to the bottom of the gorge was great. The bridge does a great job of inducing vertigo. The history and information regarding how it was constructed was fascinating.
The best way to go through the gorge is on a raft. Beats the train trip by a factor of 100. Class three and four rapids which means they are the biggest waters a novice should be running (ability to swim strongly is required, however). You will get wet, cold and maybe dump trucked at Sunshine rapids or smashed into the gorge wall at Wallslammer, make it this far and then hope that Boateater isn't hungry. Worth the price of admission.