I assume you mean a Tarpon 120 by Wilderness Systems. You cannot paint a rotomolded kayak. The oil in the plastic will make the paint peal and it will look terrible. Stay with the color you have and add the accessories you need.

My choice of accessories would be:

1. Scotty fly rod holder at the front of the cockpit.
2. Scotty fly rod holder on the casting side behind the seat.
3. Flush mount rod holder on the non casting side, behind the seat.
4. Anchor trolley system and 1.5# folding anchor on your non casting side.
5. Stakeout pole (can be made from 4' section of PVC with the bottom cut at 45 deg and a "T" at the top)
6. Paddle leash.
7. Kayak leash to attach to the front of the kayak ( I use the front handle at a tie off point). This is just a nylon 3/8" rope about 15 feet long that you can tie around you waist when you are wading.
8. And, of course, the obligatory milk crate.