A good float on the Skagit would be Marblemount to Sutter creek. It is about 5 miles and has good water from top to bottom. This would be a half day float. If you want to spend more time on the river, Drift from Marblemount to Rockport. Again good water.You may run into some silvers while you are out. The skagit gets a small run of summer silvers. On the Snohomish I would go from Toulco to Douglas Bar.