As others have already mentioned, use the washroom before the flight, and bring a book. Enjoy the view out the cockpit if the pilots decide to leave the door open.

Oh... avoid row 5 I believe it was. There's a hump in the floor, so legroom is greatly compromised.

I survived twice weekly flights on the Beech 1900D YYZ - GRR over 4 months. You'll be fine with just the one flight.