I'll go first,
My Must-Haves are:
Rubber Floor Mats (Either Honda or WeatherTech)
Rear Cargo Mat (Honda)
Rear Side Protectors (Honda)
Body Side Molding (Either Honda-color matched or After Market-black)
Door Visors (WeatherTech)
Low-Rise Hood Deflector ($85 less than the bigger one) Prevents rocks from hitting Hood on highways
Mud Flaps
Rear Bumper Applique: Prevents scratches on your bumper if you drag something in or out of rear area
MIGHT Buy - Need to investigate:
Running Boards: I recall complaint about these on the Ridgeline, being too low and then bumping your shin into them, the Passport may be taller and this would help prevent those brain-deads who open their car door into yours
CD Player: (Honda) At $310 it is expensive and if the Dealer wants even more to installing, I may forgo it..
Non-Honda MUST-Have:
Senrty-Safe Biometric Gun Safe (about $170 on Amazon - I plan to somehow mount this in the rear hidden area)
Clear Mylar: I had the entire front end and door handles done on my last car from a local business and may do it again, I may even consider doing the entire top - to keep bird poops from etching into the paint (& Clear-coat).
