My SO is a native of the Cape as well. She's got one of the highest bars for seafood I've ever come across.

I agree that tilapia isn't the best but I think you're also giving short shrift to the west coast. While is may seem like halibut/salmon are the only things on the menu, you need to pay attention to the seasonal fish they have on offer. Rockfish, sardines, squid, mackerel, albacore, ling cod, herring, and seabass are delicious and available in season up and down the coast.