its all rideable on a 20" i would say, you should head up for a play around sometime, wasnt at all busy last time we went up, good place for an afternoons ride, theres also a few quarrys nearby that are good for trials
We run a weekly unicycle club over in Denton (East side of Manchester) which you’re more than welcome to come along to. We meet on Tuesday evenings from 7-9pm.
Here’s a link to directions recently posted when we organised a hockey tournament. There’s also a map of the school grounds showing where our hall is.
I ride up and around Rivington practically every weekend. At the moment I’m up there Saturday mornings just as it gets light (for a couple of hours). You’re more than welcome to come along for a ride, but I must say it’s more muni than trials that I do.