I passed this along Hwy 45 the way back to Willows and was thinking that I might set the tag there but I liked the Museum better and this may have been really hard to find... although I had taken note of the address just in case:
I stopped in Vacaville at around 3:30pm or so to take a break and upload my tag pictures. Traffic had begun to back up and it was starting to rain pretty good so a rest was really good. After I posted my tag pictures I found out that I had aced Mac out of the tag... About the time he made it to the tag to take his picture I was stopping in Vacaville to post mine. Oops!
Trip total: ~430 miles