Excavator use

Hello all. Have an excavator rented for the week. I cleaned up and acre of trees and stumps a land clearing company knocked down and stacked for me. Scooped a bunch of compost and manure. Took a couple of trees out. Finished what I wanted to yesterday. Any ideas on something to try and get done? Toss any idea that you found useful. I thought pond but I dont think I have the time or resources to maintain the hold i would dig.