I have a 7'6" 3wt TFO Pro that I really enjoy. However, I think an 8' or 8'6" 3wt may be a bit more versatile in the park. While the shorter rod will help keep you out of the overhanging stuff, I would have really liked to have some extra length to keep the fly line off the water and out of conflicting currents.
I have a cheap Scientific Anglers reel ($29?). For the park, I can't imagine a reel is used for anything other than holding line. If you are fishing on bigger waters, than you really need to think about reels...