Use the app and bring plenty of back-up phone chargers.
Get into the spirit. Ask the CMs their backstories, make chit-chat about galactic events (keeping in mind you're in the Sequel Trilogy timeline.)
Follow and interact with all of the characters as much as possible. Even if you don't get much personal facetime, it's always fun to watch the stromtroopers, Kylo, etc, interact with guests.
Go the extra mile and come up with your own Star Wars "story" that you can share with CMs and characters. As others have already said, use the local "lingo"!
Ask to stand at the bar at Oga's, it's the most fun place to be (unless you're exhausted and need to sit.) You'll get swifter service and will have more facetime with bartender CMs for all of the above interactivity.
Also chat with your fellow guests at the bar and at Docking Bay 7. We found that every single person we talked to was having fun. Enthusiasm and good cheer are infectious.
If you don't get to be the pilot on Smuggler's Run, just make the most of the experience regardless. Terrible pilots can make for a more "fun" experience anyway. Don't let that get to you, just enjoy yourself. If you're the Engineer, ignore your job most of the time, as it's more fun to just watch the ride than be distracted by constantly pushing buttons.
Mix blue and green milk together.