How about a Serendipity, Indiana-Legend, Tennessee mashup? My story in the Beach Brides Series, KIM, takes you to Serendipity, Legend, and other places–on a road trip that will change lives.
Jon Whitfield was engaged when he “landed” the message in a bottle on a fishing trip, and it disappeared before he could decide whether to respond. Now unattached, he’s on a road trip with Kim Rose, whose gratitude in spite of a painful past reminds him of the touching note he wishes he’d kept. 
Pssst–Serendipity readers, Kim was the nurse aid in Serendipity, Indiana Book 2, Emily’s Dreams! 
Here’s the prologue for KIM:


Kim’s message in a bottle…
I’m writing this letter under protest, because a bunch of my friends are each writing one. And no, I don’t need to hear the old question, “If your friends were jumping off a cliff, would you jump too?”
Answer: No. But I would write this silly letter.
FYI—I don’t expect this bottle to be found by the man of my dreams. Though I’ve had some rocky times, I am not desperate for romance.
I have a great career, friends, and a life I enjoy. I’m considering adopting a pet. So, you can see, when you read this sometime in the future, I’ll probably be much too busy and happy to become involved with you.
This is just fair warning, because I am an extremely honest person. If you are married, please burn or shred this note. Or you can seal it back in the bottle and chuck it into the ocean again, if you’re the romantic type.
If you are not married or in a relationship, and want to be my email pen pal, I might be open to that. But nothing more. I expect we have zero in common beyond a possible scientific curiosity, re: bottle floating from where I tossed it to wherever you found it.
Makes me think, for some reason, of Star Wars. Are you a fan of sci fi?
Do you believe people are fated to certain experiences?
And do you believe it’s important to stand by someone even when leaving is immeasurably easier? If your answer to this question is “no,” please forget this bottle came into your life.
Yours truly (because how else should I close this?)
P.S. The girls are watching to make sure I fill up the page. Otherwise I would have written less.
Like this:
Hi. I don’t believe you’re out there.