Just got back from my trip to Scotland, and while I tried way too many beers to list, I will share some and a couple of my favorites beers and places that we went. We finished our trip in Glasgow and went to West and absolutely loved it. It was a nice change from the cask ales I had been drinking, and the German food was my type of eating. We (my wife and I) also loved all the Skye ales; we tried the Red, Black, Otter Copper, and Golden something. We also liked something called Fraoch heather ale (brewed with heather) that we found around.
I had a few pints of the Stewart Brewing 80/-, Deuchars IPA, Caledonian Ale, and McEwans on cask...all pretty good. I did try one of the Fyne Ales and didn't love it, and we tried a couple from Williams Bros. Brewing, which were OK. I also tried the the Black Isle Red Kite, which was good, and the Black Isle Heather Honey, which was really sweet with honey flavor. Too sweet for me, but worth trying.
Finally, if you're in Inverness I would definitely recommend going to the Castle Tavern. Everything they had on cask was really good (we tried the An Teallach Ale, An Teallach Hector, Isle of Sky Flora Mac Donald - brewed just for the Tavern, Rudgate Brewery No. 7 - brewed in York, to name some) and the food and atmosphere are good too. Great place to spend a night.
There were more, but too many to list. This being my first trip to the UK, the biggest thing for me was drinking the cask ales (real ales, as they call them). So much different from the kegged beers in the US. Also, I noticed that they almost consider ales and lagers to be different drinks...every time I asked for a recommendation they asked if I liked ales or lagers, as if I had to chose. I guess it's a starting point, but I don't think I've ever been asked that in the US. It was also interesting how there were very few beers above 5%.
Great country, beautiful landscapes (especially on the islands), good beer, and really friendly people!