I absolutely and utterly loved the Lakes District and Tintern Abbey. I found a pretty good tour through the International Student House that took us to Tintern Abby, Hay on Wye (a tiny village with more bookstores than anywhere ever), and a couple of close to the border Welsh sites. Also, if you're in Wales anyway, Pembrokeshire National Park was one of the most beautiful places I've been.

Dublin is a freaking awesome city for a lit nerd- the Writer's Museum, Trinity Library, a ton of writer's houses (and a kick-ass Literary Pub Crawl). Not to mention the Guinness Brewery and the Jameson's Distillery...

In London, my favorite museum is the Tate Britain, which has a whole room of William Blake paintings, and huge collection of the pre-Raphaelites. If you like modern art, the Tate Modern is pretty freaking awesome, too.

I definitely highly recommend the walking tours- they're generally pretty cheap, and the tour guides are usually fantastic (England has really high standards). Sherlock Holmes' London, Jack the Ripper, Oscar Wilde, the Beatles, London Oddities... the list goes on, and they're all a blast.

And if you can get there for cheap, I definitely recommend the Scottish Highlands. Especially in the summer.