I also got the Renaissance for $35 a night thru Priceline. This will be our first time staying at that hotel and it's nice to see all the reviews about it. Following is one of the many informative directions on how to use the back way. It was kindly given to me by one of the many DISers on this board but unfortunately, I can't remember which one (Senior Moment?) Hope it helps.
There is a sneaky back way into WDW that means you never have to see Hwy 192 again until you leave . Take a right out of the parking lot toward onto Maingate Road toward the Disney Company D building. At the stop sign, take a left and go along the Company D building with the parking lot to your right. You are actually still on Maingate Road. Once past the Company D building take a right at the stop sign. This is Sherberth Road and it takes you right onto WDW property. You will end up at a stop light at the intersection of Sherberth and Osceloa Parkway. Animal Kingdom Lodge will be down the road to your left. Take a right and follow the signs to the parks. To return to hotel follow the signs to Animal Kingdom Lodge and take a left onto Sherberth road. You're really only 10 minutes to any of the Disney parks, including the Magic Kingdom's parking lot.