We just took the 3 hr. trip one of Trip Advisor's reviewers recommended--Delta Loop. We left Sacramento via I5 and then Highway 12. It took about an hour to get to the Loop, 15 minutes to drive around the Loop and an hour an half to get back to Sac (traffic & construction). The few restaurants we saw along the Loop didn't even look open, and most had no views of the water. The views along the road were nothing to shout about either. I think this area must be more inviting to boating community. Definitely not worth the 3 hours spent driving.
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