We were fortunate enough to have Alan as our guide. We hit a few local pubs in the area, and he gave us a history of the places as we sat down in each place and had a brew (included in the price of the tour). With a Groupon, the cost was $17. Your guide should generally be tipped $5.00 per person. It's a nice way to get to know bits of the town, and hear a little history.
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