Send a message to Claire lovethelight, she was recently there and might be able to give you some tips! you can also check out her blog in February Claire's Blog, it has some nice photos and all about her experience ;)
I hiked the Inca Trail in 2005, and it was one of the highlights of my life. I didn't even have an SLR back then, but took thousands of photos. A couple of things from a touristic point:
Take it easy - you're at altitude and it takes a couple of days for your body to acclimate. Unless you live at altitude, you might get really sick.
Don't eat large quantities - this is tough because the food is fabulous. But at high altitudes, your digestive system slows way down, and you'll be suffering from serious gas pains if you do.
