When are you going to be there? The Bedford Celtic Heritage Festival is October 8 and 9.
http://www.celticheritagefestival.org/ It's held at the Bedford Boys Ranch (see Cynth's map for an idea of where it is), which is in a dry county, so it's the only Celtic/Irish festival in all of christendom that does not have Guinness. But the tunes are good, and you'll get a kick out of seeing kilts with cowboy boots and a cowboy hat.
From what I saw of Plano when I was working in the Dallas area, it's pretty much whitebread. The biggest attraction there is a mall. If you don't have a car, you're screwed. Things are a lot father apart than in your part of the world, and Texans have no sense of distance. If you can make it somewhere and back without packing sandwiches, that somewhere is considered close. From Plano, you can take the train downtown to see where Kennedy was shot. Big deal.
Just before I left Texas, someone recommended the Trinity Hall pub --
http://www.trinityhall.tv/ -- but I never made it there. The menu looks kind of chichi for a pub.
If you want to see real Texas, go to the Ranchman's Cafe in Ponder (population 400).
http://www.ranchman.com/ It about half a hour away up I-35 E. There is absolutely nothing healthy on the menu. Try the calf fries or the deep-fried quail quarters as a prelude to a very good steak. And don't forget the pie. If you're lucky, they made buttermilk pie that day. (Ponder is dry, too, but you can bring your own.)
And one last warning -- Do not eat BBQ or chili in Texas. Both are vile.
(gonzo, on the other hand, will soon be heading to Houston, where they have real oysters rather than mountain oysters and significantly more hurricanes than the Dallas area. )
They do have rattlesnakes down there. Don't put your feet or hands anywhere you haven't looked at first.
