I've said this before but "Water Music," the first novel by T.C. Boyle, is among the greatest books I've ever read. It's two simultaneous stories which eventually converge - one following the fortunes of hapless explorer Mungo Park as he struggles to find the source of The Niger, and another cataloging the depraved antics of ne'er do well Ned Rise in the filth and deprivation of 17th century London. It's full of hilarity and rich, colorful language. I enjoyed every sentence of it.
One of my other all time favorite books is "Up In The Old Hotel," a collection of articles written mainly in the 40's and 50's by New York journalist Joseph Mitchell. He painted the most compelling and interesting word portraits of quirky characters from the period - everything from street bums to museum curators to child geniuses and commercial fishermen. It's one of those books you can just open at any page and start reading - his use of language draws you in immediately. I've read it multiple times and I have trouble putting it down when I do.