There are some with unique features, such as the double-reef sites in the south, the Hilma Hooker wreck, and of course Salt Pier.
I was thinking along these lines; the distinctive sites. Speaking of the west coast...
1.) Karpata - really not that distinctive to me, though I liked it; fairly lush, and often spoken of and thus popular. Nice to go see what it's about, and there's the big concrete block I enter/exit beside.
2.) Oil Slick Leap - the big, near 6 foot giant stride is cool, and at least when I was there years ago, it was a good dive with with neat wildlife.
3.) 1,000 Steps - yes the walk back up is a 'feel the burn' experience, but the staircase is a nice photo op.s, and cool to see.
4.) The Cliff - small vertical wall. A boat dive site, Small Wall, is similar (but ironically I thought it was bigger).
5.) Salt Pier - others described. You can only dive it when there's no ship in, and you likely won't know day-to-day whether one will be, so if you're driving by & see it open, dive it at least once.
6.) Hilma Hooker - the wreck, and if you can get past focusing on that, a double-reef system.
7.) Angel City - nice double-reef system; I enjoyed heading out over the 'sandy canyon' and diving the distant reef. I imagine you could do this at Hilma Hooker, but A.C. was nifty.
8.) Bari Reef - really nice thought it's hard to describe any major dynamic feature. IIRC, years ago I was the site where a large diversity of species was documented, and sort of got minor area fame for that reason.
9.) Sweet Dreams - hardly ever hear anyone talk about it, but IIRC, it was a really lush, good southern site.
10.) Windsock - the dive site, not the resort. It's fairly easy entry/exit beside a large wooden pier (I assume it's still there?), which makes finding your way out on night dives extra easy.
There are a number of other sites I like for some reason, but those are the ones that were distinctive to me.
Richard.