Theres a situation here that may be related to what you are talking about, and perhaps a more specific way to accomplish what you are trying to do, with significantly less capital outlay
A 27 hole country club here in town fell on hard times about a decade ago (urban flight & whatnot), and the golf course land was bought by a developer, with the intend of turning the fairways into condos. However, because the land was zoned for "golf use only" they needed a variance to do this
The neighborhood association liked having green space in their back yards, and made sure the variance was not granted, so the property went into receivership, and was bought by the city, and parts of it used for flood-control areas (a bayou runs throuth the course)
Now, our club has gotten approval to build disc golf courses on it, with the support of the neighborhood. So, several good things:
1) Though city owns it and is contracted to maintain and mow it, its NOT park land, which makes some rules less tricky
2) (in this case)Golf Course land is already zoned for GOLF, so easier to get approval for disc GOLF
3) Strong HOA of ppl who bought there to live on a golf course, thats supports having GOLF in their backyards, and keeping fairways mowed and looking nice, to help push through.
4) Club willing/able to provide and install baskets, etc
5) Drainage is excellent (a big issue in Houston, many DG courses dont)
So, I like where your head is at Jeff, but rather than look for undeveloped land on the outskirts, why not repeat this model and try to turn bankrupt ball golf course land taken over by the city into DG courses, or maybe convince a neighborhood to "invest' in some blighted land thats an eyesore, to turn into a DG course.
There's LOTS of ball golf courses that are struggling/going under, leaving tons of available green space to be developed into "something" If theres a strong community/neighborhood/HOA in that area, those people will be looking for anything besides tall grass, dumping, and criminal activities that go along with having such a big piece of vacant wilderness right behind their houses.
Especially if the club is raising the money to install course, they might get behind something like that.
Unlike city parks where other park users may fight disc golf being there, unused land like this
If the HOA gets on your side, then they influence their local representative who hopefully can pull some strings and get you official approval.
I'm making it sound easy, but its not. One of our guys worked tirelessly for several years to make this happen in our case, but at least you know its been done before.
BTW the courses are great. Heres a link to the 2 we've installed sofar (with room for at least 1 more)
http://www.dgcoursereview.com/course.php?id=7415
http://www.dgcoursereview.com/course.php?id=7530
I've played a lot of DG courses that use "repurposed" land, or space that undesirable for other uses for some reason or another.
-The grounds of an old Prison
-Flood control areas, perhaps where neighborhoods got wiped out and city doesnt want them to be rebuilt
-Neighborhoods in-town that have gren space, but are "on hard times" (not saying the middle of the hood) due to suburban flight (assuming your city is starting to revitalize downtown areas) people in these area welcome the traffic a DG course brings moreseo than NIMBYs next to suburban parks might
-Parks in the middle of industrial areas/airport
-Former landfills
Just some ideas- since municipalities want to collect property taxes, they know they wont collect any off vacant lots, so its also in their best interest to keep property values up for the tax base. The "undesirable" land may not be what you woudl pick, but if it cant be used for much else, less likely the course gets pushed out.