St Austell Brewery Visitor Centre

 The main brewery of Cornwall has a unique visitor centre and guided tours of the brewery - you go right in amongst the day-to-day working and see the beers being brewed from start to finish. At the end there's tasting of some beers and a free pint! (or soft drink for the under 18's)

It takes about an hour, so if you've got a morning of afternoon to kill it's well woth a visit. They have a small but excellent restaurant so you can do the trip then have a meal - or vice versa. Under 8's are not allowed on the tours but there is a small museum with things to do.