OK people have mentioned various shore dives, but not in one list.
Staying on the west side of the island, going north to south, you have:
- Cobalt Coast
- Turtle Reef (aka Macabuca)
- Lighthouse Point
- Eden Rock / Devil's Grotto
- Sunset House
Each of these has an onsite dive shop that will rent you tanks and weights. Definitely no valet service at any of these - you sign the waivers, pick up your tanks and weights and are on your own.
Of those I think Turtle Reef is my fave, although it got hit pretty hard by a storm last year in February and it's only starting to recover to be the site we knew and loved. The fish are there, but the sponges and seafans aren't yet.
We have two underwater statues - the Lighthouse Point and Sunset House sites, and Sunset House has a small transporter wreck that often has some nice critters.
There are a lot of west side dive ops - some will take you to the north wall when conditions allow, but I find that the condition of the reefs is better on most boat dives than the shore dive. You can contact each and ask about whether they insist on valet or not, and then make your decisions based on the answer. Some ops focus more on the tech side, while others are more for the mass market.