Did you do the plane wrecks in Rocko? Last time i did them, it wasnt too bad but the vis got awful within 30min.

Anywhere at Rotto (but then it doesnt become a shore dive of course after the costs involved getting to Rotto...).

Busso Jetty can be fantastic as do the jetties up around Exmouth. Theres also some spectacular spots around Esperance / Cape LeGrande / Cape Arid but then thats a massive drive and alot of those spots are really only for advanced divers.

MAAC / North beach areas are ok, although can be a little boring but if my memory serves me correct theres some nice caverns etc just to the south of the old fisheries building in Watermans.

Failing that, i know The Coombs is popular at night if you want to head to the river.

Is there a reason you only want to stay shore based? I know if you dont have a boat, its hard but it opens up a lot more ocean!