Thank chico bill, a useful reply. Our time in mexico has expired, we have to leave and its our second time living here so hanging around is less appealing then somewhere new. We've lived Costa Rica 3 times over the years so looking for a new experience. You've given me reason to pause and take a closer look before taking the plunge. Colombia is also on the table#1. You can find a clean dog friendly beach easy enough but it won't be near # 3.
#2 - Forget the night scene and any chance to hit upon 'good girl'. While a good girls exist, they are quite rare here but you won't find them in any 'night scene'. And if you are looking for one that has a work ethic then you double the rarity.
#3 - Stay in Mexico - food is better, better selection and better quality at a much lower price. Doctors - ditto, stay in Mexico. While many people claim they get good medical service here they are being a bit delusional. At best it is hit and miss (mostly miss), but for an emergency you are screwed. Update your will.
#4. Riding a bicycle any distance in DR will lead you back to # 3 (Update your will). Stay in Mexico if you found a place to do that safely.
#5. Reasonably safe most areas, except the parameters you listed will lead you to live in a sparsely populated area where you will stand out like a pimple on prom night. Some one might decide to pop you.
Mexico seems like a better choice for you, or Costa Rica. And the girls with higher level of education and Spanish blood in Costa Rica means you can have all of the above (will maybe less prepackaged food choices) but better health care too.