If you take I-5 through Oregon and Cali:
Def hit up Eugene, it's also skateable in the rain
Umpqua Hot Springs (the waterfall is pretty sick as well), worth the detour, especially if you've been hitting lots of skateparks
In CA: Weed, Mt. Shasta, Redding, Corning (pretty rad), Willows (Sycamore , fun the flow around)
Anderson and Red Bluff parks are eh... not the greatest but they are options