We actually live about 15 min from Dorney and we are avid bikers, so I can probably answer a lot of questions you might have. As far as bike paths go, what kind of riding are you looking for (flat gravel path, paved, mountain biking, etc)? There are many trails in the area, so just let me know what you are looking for and I can offer some suggestions. I'm not sure about campgrounds in the area, but I can check if you would like-just let me know. When are you planning on visiting the Lehigh Valley? You might also google lehigh valley visitor/convention bureau for more info. There is a huge music festival in August (
www.musikfest.org ) with all kids of food and music to enjoy.
I agree that Knoebels (
www.knoebels.com ) is a great park and they have camping next to the park (tent, RV, cabins and TEEPEES

) as well as another campground about 10 min from the park (I believe they offer a free shuttle to the park) that is also owned by Knoebels. Knoebels is a great park (free admission, free parking, you can bring your own food and use their picnic tables) with VERY reasonable prices. They also have a large pool and waterslides to keep cool. The food is great (they've won many theme park food awards) and their is lots of shade throughout. I'd say Knoebels is probably about 2 hours from Dorney if you wanted to split your stay between the two. There really isn't much to do near Knoebels, so I couldn't see spending 6 to 10 days there (although there is some biking around there as well-it's just mainly mountain biking). Let me know if you have any questions about Knoebels as well, I worked there during college and still go back frequently.
GraysMom