Lots of memorable first holes. Besides the history of TOC< where my knees shake, there are the less historic courses, where I consider a great first hole one that tells you right off the bat from the tee its a very special course.
First at Crystal Downs is that, for sure.
Slightly less so, but also important was Mike Young's first at Long Shadow. Driving in the entry, you see the first hole and I could barely wait to get out of the car to see the course.
Funny, and while I haven't played them all, not many top 100 courses have truly memorable opening holes. The aforementioned CD and SH, and maybe Shinny, SF (although I like 10 better) and maybe Spyglass, with NGLA maybe in the running, too. Maybe its the old design mantra of a gentle handshake to start the course?
I say that because when designing the Quarry up in MN, I had a routing with a Cape Hole over the same lake as 18, water on the slice side, from an elevated tee. Owner had concerns about such a tough opener, it faced east and had sun problems, and the coup de grace was some environmental issues, as an old RR loco servicing facility was in the fw area (although I do note the area has been developed now, so many those superfund rules that would have cost millions have changed a bit) But, it would have been memorable.