Rattlesnake rock has a number of quality sport routes that are not slab climbs. There's a higher face with somewhat dirty, but fun 5.10 routes and then a lower section with a few harder ones, including the classic Rock n' Rattle (11c).
Just further North than Castle Rock on Highway 2 by about a quarter-mile is a paved pull-out on the river side. Park there and find a trail entering the woods at the northern end, marked by a cairn. Steep hiking brings you to the crag in about 15 minutes.
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