We took the family to see the Shasta State Historic Park. There was not a lot to see. There was about 5 restored buildings, about 10 left over brick walls from old buildings, and a small museum.
There appears to be a blacksmith store open on certain Saturdays in the year, but there were not open when we stopped by.
The stop included a few old carriages to look at and a small park / picnic area next door.
There was a bathroom which was helpful.
We only stayed about and hour and headed to our next destination. We had thought there would be more to look at, but the sights were pretty limited. Your best bet is to do a quick let's learn stop and then go another 8 miles and swim in the Brandy Creek Swim Area in the Whiskeytown Lake.