Enjoy the climb. Do you get to ride back down too? I remember seeing a bunch of "bicyclists" coasting down Haleakala on Maui. Looked like fun. Well, except for the pace guy keeping everyone from getting killed by going too fast.
I've done the ride down Haleakala. IIRC, it was about 39 miles, 37 of that was coasting. That was before disc brakes were developed for bikes, which are still mainly only used on mountain, cyclocross (hybrid of mountain & road), and touring hybrids though it's touted as the next great thing for road bikes. They had drum brakes on the bikes as you would have burned up rubber pads pretty quickly. It was an interesting study in aerodynamics, tuck in and you'd fly past other riders, sit up and it was like deploying a parachute.
Highest speed my computer recorded Saturday at Cavanal was 45.1 MPH on one of the descents. The road is a little rough in areas and there's some spots with loose asphalt and gravel, as well as many switchbacks. It was wise to keep the speed in check. It was nice and cool with a little rain and lots of cloud cover. Quite unusual for late July!