This is the same place as Maunakea, so I am not sure why it is listed twice. People come here to view the night sky. It does get very cold here, ie 0C or 32F, so you better dress for it. I have written a review of Manuakea and you can see the details of this there

We were keen to drive up to the Maunakea Visitor Information Station to experience driving up to 2800m, since one of New Zealand's highest public roads is only 1100m We didn't feel any affects of the altitude on the drive up but everyone will be different. We checked out the Information Station before asking a ranger where we could go for a walk. The ranger was a bit dismissive so we ended up walking up a hill directly across from the Information Station. The views were good but not amazing due to cloud cover on the day. The interesting thing was how tired we got going for the short walk up the hill, do not underestimate the altitude!

Make sure you have 4 wheel drive!! can not drive to the top of the mountain without it. Give yourself plenty of time to acclimate to the elevation ~30min. While you wait, shop, use the restroom or learn more about the mountain top and what they do. Bucket list item to go to tallest point !! but be ready for a steep drive up and slow ride down.

This time we notice to go by rental car until Onizuka information visitor center. Sky is deep and clear blue feels close to the space. Sunset is famous but It’s better to go picnic and not need to drive dark, if you climb up and down keep slow traffic and low gear. Go around there it’s necessary to notice the signs to keep Hawaii’s great nature. That day also some groups took lunch. Low air pressure made our crisps huge!

Reviewers have it right. They are very particular about having a 4WD to get up to the summit at the inspection point.... including making sure you are engaged in 4WD-Low; have at least 1/2 tank of gas, etc. On the return to the inspection point they even checked our brake temperature. Technically it is just a dirt road, and gov vehicles that are not 4WD go up and down all the time. The view at the summit though is very impressive. A "moonscape"... nothing growing. Just the telescopes

Arrived around 6:30, no problem parking at visitor center. It took a while to hike up to the viewing point across the road. Both my wife and I felt the effects of the high altitude. It is very windy at summit, cold on hands and face. Sunset was great. Hiked back down and waited for dark. Once it got dark, the influx af vehicles coming down from the summit along with people constantly turning on their headlights ruined the dark sky night viewing. After 30 minutes of frustration, we gave up and started to drive down. PRO TIP, leave the visitor center and park at one of the right side pull offs about 1/2 mile down from visitor center to view the stars (so much quieter and better)!

While on the Island of Hawaii we stopped by the Maunakea Visitor Center. We did not have 4 wheel drive or time to hike to the summit so we just stopped into the visitor center. There are some displays about astronomy and the area and a small gift shop. We did find a small trail that had some silverswords growing which was interesting. We thought it was going to be freezing but while it was windy it was sunny and in the low 60’s. It was a fun drive and an interesting stop.