WGI is awesome, usually drive up there yearly with my s2000 but last year took my Type R. Those blue walls can be pretty intimidating but once you get the line and some confidence then its not bad.
Once a police report is filed, it pops up on carfax/autocheck. Your insurance rates may also go up and your accident free streak might be gone as well.
Go off the record and get it done privately. That dent looks like PDR might be able to take care of it so you can save some pennies off that...