Three years ago, we did just what you're contemplating, though it was I, the husband, who spoke no Spanish. Even with contacts, it took over a year for my wife to find a permanent job, half the salary, not really what she was doing in the US. We still live with my in-laws (though that's been great -- they're not unbearably intrusive and child care is never a problem anymore!).
There seems to be almost no resources for adults to learn Spanish, unlike where we came from in the US that had many TESOL resources. UPR Rios Piedras seemed to me to be a summer program for visiting college students. UPR Humacao seems to have a program, but I never drove out to check it out (electronic methods generally inadequate for such tasks). Pan American Language Institute had no group program but could accomodate me for $2000 per group of private sessions -- not doable when we had no employment. I've basically learned the little I know on the street and on the job. I've met fellow ex-pats here that after 20 years speak even less -- something that astounds me, but on the other hand I still remember how big an obstacle the embarrasment of murdering the language in public was for me the first 18 months or so. Now I just murder away!
For the children, there are little biligual academies all over the place -- we're on our third one since we got here. Our daughter who was six had significant adjustment to socializing in Spanish, but she's ended up learning it -- though her courses in Spanish are still a challenge; she's simply not at the level students her grade are at. The daughter who was three was too young to be traumatized, but now faces challenges in both languages, mixing the sounds and rules as she attempts to learn both simultaneously. We're working with a speech therapist for the Spanish part now. I think for her original language of English, ironically, she will always have a Puerto Rican accent, being influenced more now by her classmates than her parents. I have to correct her past tenses all the time now.
As for living "en el campo," it would definitely depend on the particular location. Our barrio was a sleepy hamlet surrounded by cane fields when the house was built. Now we're surrounded by warehouses, tire shops, bars, and an open air concert venue. I'm convinced there's no such thing as zoning here (outside the gated communities), so you never know when your neighbor will turn his back yard into an ad-hoc auto body shop (that's going UP our mountain). The gated communities at least provide some buffer, but I climbed to the top of our mountain the other day and could STILL hear the damn karaoke clearly.
I also recommend visiting a prospective neighborhood during morning rush on a school day. The road placements are generally at hazard, driven by easements across private land. In our case, there's been so much development on the one main road that it can take an hour to drive the one mile to the entrance to our barrio.
As for the out of doors, our personal experience has been that we don't hang out there as much as we did in the US. I think the intense sun, humidity, and mosquitoes are to blame -- the same factors that drove the first Spaniards out of the interior. Maybe way up in the mountains (I was impressed with Barranquitas) or on the coast with the Atlantic sea breeze.
Even with all the challenges, I have to say we've met our goal of having bicultural children is being well met. Best on your decision.