The lounge is the main reason I choose Polaris over other products. Go early and enjoy!
I don’t know that you will get Pj’s but make sure to ask for a gel pillow if there isn’t one at your seat. They are wonderful.
Open one amenity kit, perhaps on the flight out. You can keep the return one for a souvenir. Even if you don’t like the products they make nice small satchels for other uses.
As this is your first Polaris flight you may not value sleep but if you do know there is a Do Not Disturb light that you can activate should you choose to skip a meal.
GO TO THE LOUNGE EARLY!