I heard so many people say that sunrise at Adam's Peak was one of the best things they did in Sri Lanka, but I think it's completely overrated. Hear me out...
We woke up at 2am after being told it it would take 3-4 hours to climb the 5000 stairs, we did it in 2 hours so this meant a long wait at the summit. It was F R E E Z I N G but we were prepared. The sunrise was lovely, the views (what we could see before the clouds rolled in) were great.
The reason why this was so disappointing is the peak itself. There's a temple up there which is closed in the low season, so we were stuck waiting on the steps outside, unable to actually see the view because we were surrounded by concrete and chain link fences.
However, I do understand that it's first and foremost a pilgrimage to see the sacred footprint of either Buddha, Adam, Hanuman or Shiva depending on your religion and it would be a completely different experience during high season, although I've heard it's 100x busier.
We climbed Little Adam's Peak in Ella the next day and it was so much better! Not as high of course, but a beautiful view and no concrete in sight.