Rode a lot of steps while I was at uni (there were a lot of steps) some of them were very narrow, steep and a decent length without a break. Probably not as narrow and steep at the lighthouse ones, though!
I found the scariest bit was rolling up to the top, the anticipation rising the closer you get, and the steeper the flight, the longer it takes to see down the flight. Then suddenly they’re revealed, and you’ve got no time to get used to the view before your front wheel is rolling over the first step. So easy to jam on the brakes and refuse at that point.
Once you’re in and rolling, you’re fine. Never came a cropper on any once I was in. Although I did pinch my jangles climbing off the back when someone appeared at the bottom of a set just as I rolled in.
My approach: Yes. Hardtail, as it’s what I’ve got. (I’d rather not be in the drops of a cx bike for this!) Unless the edge of the steps are rounded and slippery, it’s easy to control the speed down to a crawl with judicious use of both brakes. Brakes off for the last section or so for celebratory speed!
Have a look at the angle from the side. It’s often surprising how shallow the angle really is. They might only be 35 degrees, or maybe less.