Taiwan is a great place for outdoor, however, last years disaster have it more dificult to enter the mountain-areas, and there have been some resteruicted areas.
The Outdoor shops are usually run by enthusiastic mountaineers and outdoor-people. I find them unusually friendly and helpful, very eager to show other people the marvels of their mountains (highest peak some 4.000 m).
There are also outdoor/mountain-clubs and schools which organize trips etc.
There is alos some good books, however, the ones I got from my friends are in Chinese.. but the photos are just great! Enjoy your stay!
All men are jerks. All women are psychotic.
Kurt Vonnegut Jr.