In reply to Kimono: To be honest, to make the most of the area, you want a car. There are masses of really famous road climbs, or are you talking about MTB? You didn't specify? But the main thing is you need to be able to get to the access points for rock climbs and bike routes which are spread across quite a wide area. But bearing in mind that a bus up from venice is about 40 euro each way each person, and that you can get a small rental for less than that... in terms of road biking, the Sellaronda is the most famous of course, but there are loads of others - passo giau, san pellegrino, karrerpass, passo duran, passo fedaia, passo staulanza... just depends on how much you want to hurt yourself. Mountainbiking again there's absolutely masses. There are a few bike parks dotted around the place too, with Alleghe, San Martino di Castrozza, sellaronda of course amongst other rides. Corvara IS a good base, but that said you can only access sellaronda and Passo Valparola/Falzarego and Giau from there as ride without driving unless you're super fit and ride! So if you want to do others you still need to jump in the car...