For the dedicated enthusiast, or those who simply prefer to follow a sense of adventure, planning a mountain bike holiday from the bottom up can be a great experience. Numerous sources of information and advice will help construct a holiday that suits you down to the ground. Lonely Planet, Rough Guides and other travel books are always good, given that they have info on biking but also all the other aspects such as accommodation and travel routes.
Mountain biking magazines regularly run features on certain areas that can be really useful. But perhaps the easiest way is to choose a resort that is known for good quality mountain biking, book flights and accommodation, and get the local knowledge of where is best to ride when you get there.