Is there any covered shelters for use? Do they have to be reserved and rented?

There are several, nice covered shelters, but they are first come first serve. There is one building that can be rented for use >> https://www.fallspark.org/rental-facilities-pendleton-indiana/falls-park-community-building

There is a building that can be rented ....when you come of the main street go through the park past the falls and a peace on back is the building I believe on the right...I don't know who you talk to about it

Yes