Rising sea levels would generate more 'drowned coast' effects - Chesapeake Bay, fjords, maybe marshes. Eddies of surface currents might get you spots of sand sticking out, swoops of beachy inlets. Additional beach can get deposited on the downstream side of islands or headlands. Falling sea level (or up thrust land) could expose sediment dropped while continental shelf was under water, or bare rock not yet sculpted by tides. Water level going up and down gradually over long periods in the right latitudes can get you coral atolls and barrier reefs. Land or sea floor downstream of subduction zones can have extra volcanic activity, as can random hot spots (Yellowstone, Hawaii). I forget just what generates strings of barrier islands like the Gulf of Mexico USA coast, USA's Atlantic coast, the Netherlands.

Spend some time with Wikipedia's Coastal Geography and Coastal Landforms articles, and you'll be itching to find places for dozens more!