I agree with CBadRider that a PLB will certainly work, but it may or may not provide the rapid emergency response you need for something like an MI. I used to work in a pretty remote part of the desert in Southern California and I noticed that these days there's hardly any areas that don't have at least 1-2 bars of cell signal. The other factor is in areas where there isn't cell coverage the response times for fire/EMS/LE will be really long...like 45 minutes where I used to work.

If you're reasonably fit, take care of yourself, and don't have any serious chronic medical issues then your level of concern for experiencing a serious medical problem should be the same as for any other hazard like crime, dangerous roads etc...use your brain and trust your "spidey senses".

Have a great time! Sounds like a fantastic post retirement plan.

Sam