River Plantation is the e-zest to get in and out of on and that usually where we stay. There are plenty of campgrounds down Wears Valley Rd like Clabough's cg, Eagles Nest cg and Holly Haven. We don't like to stay at these cuz there's a lot of traffic leaving on Sundays so you sit at alot of stoplights trying to get out. A new one that has opened up recently is Pine Mountain RV Park but again you will have to fight alot of traffic/stoplights getting to & from there (but it's all asphalt sites). It's kind of in the middle part of PF.
The cg closest to the interstate is Riverside but I would not recommend it at all. It has nice sites but they only have well water which has a tendency to turn red late in the season.
The one I would definately not use even tho it's a nice cg but very difficult getting out of is Ripplin Waters on Hwy 66. This is on the main road going to / from Pigeon Forge/Gatlinburg area and is very, very busy, plus the state is widening the highway adding to the problem.
PM us if you want more info.