There was never an "Incredible Hulk" type piggy bank thingy at the Float Trip. So that's a false memory. But...towards the end of it's life, as one road through the cave, there were a couple of "reverse" faces embedded in the cave walls. As you floated by them, they appeared to "turn and watch" you go by. There was also a glassed off room in the cave that you would float by; it had kind of a haunted saloon type interior with a piano and "ghosts" floating around. This was done with mirrors. That room may have had gnomes at one time also. In addition to some of the things already mentioned, some of the "sights" one might see on the float trip included a tipping outhouse, an encampment with a moonshine still, a bear cub shinnying up a tree, "echo rock," a real prairie dog town, a couple of places where there was water shooting across the "river" and it stopped just as you reached it.
There was a time in the mid-late 70's when there was a medicine wagon show in front of the glass blowers shop where the street access to the demo area has now been opened up (used to have to go thru the merchandise area to get to the demo). Medicine men were Art Runyan and DA Callaway, playing piano, singing, and hawking "pills" with the help of a beautiful assistant.