Well, Mexico is my favourite country in the entire world (sorry, DR, but you're a close 2nd!)
I love it there, lived in Zihuatanejo and up in Costa Careyes, so if you have questions specific to those areas, do let me know!
Why not look into flying over to Provodenciales in Turks and Caicos? There are flights from the DR over, just a magazine-read away
It's a pretty quiet island, pretty much all full of all-inclusive resorts and a spectacular beach. If you snorkel or, even better, if you dive, you'll find it perfection. Not a ton of crazy stuff to do, but for a relaxing holiday out of here, it's a perfect option. I lived in Grace Bay for about 2.5 years, so I'm always happy to tell you more if you need!
Otherwise, there's always the option of renting a car (I know you wanna get away, but if flights and all don't work out, it's just a thought...) and driving out to Las Galeras in the North, or being treated like a King and Queen at an exclusive little resort in Punta Cana, etc....it's still an escape, but a little more of an affordable one. Just a thought
Lemme know if you like any specific notes on Provo or Zihua or Costa Careyes!