I was there once that I can remember...but was only a very very young boy. When my family moved here from the old country, Riverview Park was a common meeting place of fellow Germans. They had lots of events there. Not sure what made me look for this today, but I found two reports about the old joint.
This first report was on the 100th anniversary (by Tony Lossano)
This second report goes back to 1981...
The park closed in 1967.