Qualifying it with "near the sea" and NOT seaside you could include some of Baja, Mexico areas around Rosarito. $100k these days though won't get you the best p

Qualifying it with "near the sea" and NOT seaside you could include some of Baja, Mexico areas around Rosarito. $100k these days though won't get you the best place, but if you could swing $200k you can get a condo in an older building and/or a small house. You can purchase something in a village between Rosarito / Ensenada for $100k too.