I wish you the best of luck. Just try and get almost every trick in the books. My suggestions:

- Day/Night cycle
- Double the clothing
- Custom shoes
- Realistic spots
- Better bailing so it's more like a ragdoll. Maybe add hats falling off.
- Tons of griptape
- Realistic clothing movement (like shirt flying up and moving to the breeze)
- Better sounds

I could go on, that's just a few ideas.