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If you like a touch of fantasy/mythology then Ingo and The Tide Knot are nice. They are technically YA books, but I enjoyed them, and they are set beside and in the sea. They are about a brother and sister who find out that their father wasn't actually drowned in a storm when they were small, he was a merman and went home. Or have you ever read "The Island of the Blue Dolphin" by Scott O'Dell - it's an "oldie but goodie, and based on a true story. Or even Cookie by Jacqueline Wilson I read any of hers that anyone gives DD, before I let her read them, and that one features a new home/new life by the sea. It's only short, so a quick read, and it is a children's book, but I actually enjoyed it fir what it was, and it whiled away a couple of hours.