Boy oh boy. The Colour of Magic is certainly one of the most imaginative books I've read in  while. There is so much going on here. Basically, a tourist shows up in Discworld and Rincewind the bumbling wizard is tasked with making sure he has a good time. It's a fantasy adventure with a frantic energy that I don't think I've encountered before. Almost every other page there are new characters with new names and motivations. Sometimes they'll come back later. Sometimes they won't. You've got barbarians,  crocodile gods, dryads, water trolls, imaginary dragons, magic frogs, a sentient treasure chest with hundreds of legs,  Lady Luck herself, A'tuin The World Turtle and Death.  And the list goes on and on. 

It's a lot of fun. It's also totally overwhelming. There's enough creativity and humor here that you could fit it into several other books (which apparently Mr. Pratchett has done over the course of 40+ books). I bounced off this book a few times before. Turns out if you sprint along side it sets about the correct pace.