Cedar River Trail / Henry Moses Aquatic Center
Cedar River Trail has a nice mix of trails and scenery.
There are three places I like to park my car and ride along the Cedar River.
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Ron Regis Park -- a good parking spot for heading either direction on trail. I tend to prefer heading west toward Renton (runs by Maplewood Golf Course, a cool 180 curve that crosses under the road, and lots of tree cover for a scenic and shaded ride a couple of miles up the trail) though it's a bit more wide open and scenic/sunny toward Maple Valley. Plus when your battery runs low, you can tool around Ron Regis park and practice for your last 10% of juice.
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Riverview Park -- a small parking lot and easy access to the trail.
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Cedar River Park (near Henry Moses Aquatic Center) -- I like tooling around the various parking lot sections and sidewalk. Often I end up here as a midway point after starting further east on the trail, say from Ron Regis Park or Riverview Park.
I had also explored visiting the official rollerskate "Liberty Park" in Renton (near the downtown Renton Library), though had mixed results. It was fun to try out since it was off hours, but I don't think I'll spend much time there - overall it's very congested and has limited paths for Onewheeling.
I don't recommend Cedar River Trail for first-time riders due to congestion and some rough pavement sections.