Upper Falls Park

Yes, you just have to park outside the closed area and walk in. Great, easy hike

Not that I remember seeing... Sorry

On leash only

Yes there is a trail that begins actually all the way from Utah lake to Vivian park just above the falls. If you would like a very long bike ride its actually pretty great if you can pedal that far up hill. Drive to below the falls Nunns park exit or drive to Vivian which is much longer. The old highway is from Nunns back up to the main highway down from Vivian park. Old road on river right, bike path on river left.

Short hike maybe a half a mile kind of steep but beautiful

It does have fire pits