Pros:
Twin Creek's Red course is short enough and plenty fun enough to introduce beginners to the challenge of shaping lines in and among the trees, without becoming overly daunting. This park and the Dayton area disc golf community have done a really nice job of preserving this course while blending in a much more challenging, longer (the Black) course in the same area.
Signage here is incredibly well done: simple posts are painted red and/or black (as are the 'chastity belts" on the Discatcher baskets), so you can just play by color. Distances are clearly marked. Wooden 'next tee' arrows hanging under the baskets are likewise color coded, and there are other signs when needed. Tees are concrete and well-sized for the distances. There are trash receptacles, and an occasional downed tree serves as a bench.
Located in a large park that features ball fields, tennis and basketball courts, a walking trail, a nature preserve, a playground, port-o-lets, and ample parking, the DG course(s) use the woods adjoining a beautiful creek, so there is no overlap with other park activities.
The Red course begins with a front nine averaging around 150' per hole, while the back nine start to stretch it out a little further (200-250'), so true beginners could choose to play the first nine and keep their self-esteem high. One of the trickiest holes might be #11, which has a blind pin position from the tee, with the creek running by only 25-30' to its right.
Cons:
The naturally sandy soil along the creek can become unexpectedly slippery underfoot when overly wet OR dry, and the relatively heavy foot traffic makes for some muddy paths and fairways.
Players above the Rec level won't find much of a challenge on the Red course, and should opt to play the Black.
Other Thoughts:
Located just southeast of Germantown, OH, this course is a little bit remote, having few major roads coming over (directly) this way off of the interstate, so you'd be well-advised to print a map of the area or use a GPS to get there.