Or you could just stop on your way up and get registered. It's $74 and it's worth every penny. As Dirtcrasher says, people will gladly spend $100 for a day at the water park or a night at the bar, but they whine about dropping $74 to ride legally for a year. Granted, if you get the registration now it's only good until June, but we'll be doing plenty of rides during that time.
My suggestion, get the reg, do the ride, and then get your money's worth out of the reg. Come back up for more rides. The winter rides can be really fun, the trails are nice and smooth.
I'm a little jealous I won't be making this ride but that's OK. I'll be at the next one!
85 Tri-Zinger 60
85 ATC250SX
86 ATC250SX
87 ATC250SX
02 XR650L conversion
84 ATC 480R