I will contact the City of Hiawatha tomorrow in support of the disc golf course. I'm a resident.
It would be a good idea to get with the contractor who is doing the trail/park work and address the ditch area that will cross I believe your #3 fairway. The contractor usually knows what the city has planned.
1. Find out what they plan for erosion control of the drainage ditch.
2. Find out if and where they plan to install drinking fountains.
3. See if they have a plan for the big rock. A mudjacking bit can bore a hole in it if you wanted to stick a sleeve in it for a basket. Bitch'n is right, it might give the course an item of character. And while the contractor is there he could dig out a recess for the rock to fit in which would lower the basket to a climbable height.