Onizuka Center
You can go to the top of Mauna Kea by a car; but for that, you need a license (otherwise the good environment for observatories would be destroyed). Also, since this mountain is rather high, you need to adjust your body by taking a rest every now and then. Onizuka Space Center is located on the way to the top of Mauna Kea. This is the last station for preparing your way to the top.
You can also see the silver sword, a rare plant only in Hawaii.