I forgot to mention that if you're planning on going to see the Great Wall, and I hope you are, you might want to consider visiting the Mutianyu section of the wall. The closest section to Beijing, Badaling, isn't the best section and from the reports I've read, it is also the most crowded.
The Mutianyu section is about 90 minutes outside of Beijing and features a very fun Alpine Sled that one can take down the mountain after visiting the wall! If you do go and ride it, ignore the employees yelling at you to slow down and just GO FOR IT!
Also, there is an aerial tramway you can take up to the higher portion of the wall, walk down the wall to the ski lift, and from there you can take the slide down. Unfortunately, we took the ski lift up which meant that we had to basically walk UP the wall during our visit.
Hire a taxi driver in Beijing to take you there. We hired one of the bigger, more comfortable taxis and it was great. Don't pay more than 500 REM for a 6-8 hour rental. The driver will simply wait for you during your visit so take your time. We arrived to the wall at about 10 am on a weekday and it was basically DESERTED! We did pass a few people from Russia and Japan, but that was it! It was in one word, AWESOME!
I can't wait to go back to Beijing again someday...Robb???
Good luck and email me if you have any questions about Beijing, lodging, food, etc...
Have fun! (I'm jealous!)
Kevin