I could see being stoked on the access if it was the backyard. I live an hour south and haven't ever really been energetic about learning all the trails in Roslyn. I know theres some big slabs back in the Teanaway that are worth checking out. Honestly, Kachess is the trail to hit if cruising over i90. The trails off Cove Rd/Manashtash in Ellensburg have been getting tons of development also. That's all xc stuff with the potential for putting in some 30-40 mile circuits without much repetition.TF shows a ton of trails "behind" Roslyn though, so I was wondering if that stuff was good, like for much bigger epic rides.
Being from Yakima it has been tragic watching the west siders pour over i90 and populate the east side, especially the last 10 years. I swear most of the west siders don't even know the majority of the state is arid.