I'd 2nd the UMX timber for a great park flier. It can fly very slowly but still powerful enough to have some good fun with.
Here's a little video for comparison:
I've built a lot of foam board planes, many FT designs and quite a few of my own trying to go smaller and slower. None of them work as well as my chuck glider conversions, not to mention the fact they are nearly indestructible.
Me and the boys like doing "Glider combat" with my converted chuck gliders. Eventually they'll be good enough to join me in the air with theirs...
And nothing wrong with the FT foam planes either, as was mentioned before, the scout would be a good pick.