It looks like a nice bikini. I think you'll do well with the fold-up bottoms. And I am sure the hubby will appreciate the view from other angles.

Rock what you've got Mama. We only live once.
I think once you get your tan going, those stretchmarks are going to be less noticeable. If you are concerned, maybe do a self tanner at home before you go. By the time a self-tanner fades, you should have some natural glow from the sun.
When I stand in the mirror to check how my bod is shaping up, it's always my tummy I zoom in on too. My dh on the other hand, only stares at my boobs and butt, couldn't care less about a stretchmarks and some belly fat....just thought that might give you some perspective about what areas the eyes (at least guy's eyes) are naturally drawn towards when less clothing is worn. Accentuate the positive, right?
I hope you have a great time on your vacation!