From SSR you can go to MK and take a boat to FW, walk from the boat to the bus stop, catch the orange outpost bus, get off at first stop, walk across the bridge and follow the path to the show, reverse this to go home except you will want an orange settlement bus to get back toward the dock.
Or you can get to DTD then take the bus to FW from there(not sure if it shares with another resort), that bus will drop you off at the Outpost bus stop, take an orange Settelment bus to the 2 or 3rd stop and follow the trails(the bus driver can direct you).
Bring money for snacks(or bring your own if you want), blankets/towels are not needed unless it is chilly or you preffer to sit on the ground instead of the benches or bleachers. Chip and Dale come around to visit during the sing along before the movie starts so you may want a camera.