Greentop (02-21) basically overlooks Sevierville and Pigeon Forge, and PFPD units are affiliated there 24/7. You also may hear (if anyone is affiliated to Greentop) Alcoa PD, Blount Co Sheriff, TN Highway Patrol, Pigeon Forge Trolly Ops, and some limited PFFD Paging.
You may also be able to listen to English Mountain (02-47) in nearby Cocke Co, the Knox Co Simulcast sites (03-10), or Knox Sharps Ridge (02-20). If you end up over in Townsend, there is a site there as well (02-29) but I'm not certain how much traffic you'll hear over that way.
As you mentioned, the bulk of LE in Sevier County (as well as Knox County) is E, but Pigeon Forge is definitely clear. If there's an event in town (think car show) there are sometimes also comms on LE Mutual Aid talk groups. Enjoy your visit!