The Skykomish from Sultan to Monroe or Sultan to Ben Howard is pretty easy. The Skagit from Marblemount to Sutter Creek or Marblemount to Rockport is also pretty easy. There is one spot above Sutter Creek where the river splits that can take a little manuevering depending on water levels. I don't think it's anything that will sink you, but it could put some dings in your boat. Sutter Creek to Marblemount is a short float but easy. It's a good one if you only want to fish a few hours.