If you want to see everything that Dollywood has to offer, I'd recommend getting a Dollywood Season Pass, because if you go to the park about three times you'll have paid for your pass and it's totally worth it for unlimited visits. During the spring there is the Dollywood Flower and Food Festival, for summer there is the Smoky Mountain Summer Celebration with a drone and light show, then the Harvest Festival, and finally the Smoky Mountain Christmas.