I'm supposed to do a full day bike tour in Yangshou as part of my China tour in May 2011. I am concerned that it will be very difficult to spend a whole day on a bike when I don't use one at home (I am fit but not used to bikes). I'm pretty sure I will not be able to walk the next day - not because of my legs, but my backside. Is the terrain fairly level? Are there any other options besides a bike that can be used to keep up with my group? I want to see the area but I am worried I will hold back the 'group'. Does anyone have any suggestions?