NAC is indeed a delight. Cusco and I did our FAA IRs there last Feb/March, and I then did an unrestricted PPL to stick the IR onto.
I've been to many flying schools in my many years, and I reckon NAC is the best of them all. Excellent instructors, and good atmosphere.
We didn't need visas then, to train, but you do now. Don't get it wrong, or you'll be in deep trouble with the INS.
Unless things have changed again (ask NAC!) you don't need a visa to hire an aircraft for hours building, but you DO for any kind of training beyond a BFR.
If you don't already have an FAA PPL, you need 60 days right now to get the paperwork done for a reciprocal one.
Naples is Costa Geriatrica - where all the snowbirds fly to in winter. In summer, it's hot, humid and half-deserted.
Please say Hi to Nikki for me.