This was one of the best tours I've taken. St James Gate is the entrance to the brewery; it's a great photo opportunity, as the gate is enormous, with big letters spelling out its name. The brewery looks like a big factory, but inside you find that the building gets larger the higher up you go, just like a pint glass. When you walk in, you are directed to the center of the floor, where you see the original signed lease for the building. Everyone gets a clear token with a drop of Guinness in the middle - save this, as you will need it at the top.
The factory itself is very informative. You learn the ins and outs of making Guinness and how the leftovers are used for condiments such as BBQ sauce and ketchup. There are lots of sections where you can smell different additives, feel the grain, and even ride the Guinness train. Once you reach the top, you are directed to the Sky Bar. Here is the most breathtaking view in all of Dublin. The walls are all glass, and you can see every major sight in the city. Seats are limited, so you might have to sit on the floor. Give the token to the bartender and treat yourself to a complimentary pint of Guinness. Personally, I didn't like it, but at least I gave it a shot! Before you leave, hit the Guinness store. The prices are quite reasonable. I found souvenirs here for those people who are very hard to buy for, namely, my dad. I bought him the steak sauce and a Guinness polo. I think I spent about 20 euros.