All good suggestions. Thank you.
As I mentioned, when you have lived in places like Liberia, Iran (time of the Shah), Vietnam (before and after the war), Korea, Singapore, China, Cambodia, Saudi Arabia, Venezuela, Egypt, and Jordan for 42 years, being stimulated visually took very little effort. Learning a couple languages and cultures on the way stimulated me intellectually. A simple walk outside my home in those countries was always fulfilling.
I'm currently living about 20 minutes outside Bellingham near the Canadian border. I'm also 25 minutes from Vancouver with the Nexus. I have no doubt that I can accomplish the same stimulation living in the US, but it will take much more effort than what I've shown. The travel around my own country, volunteer work, and even visits to other countries is something I need to do, with or without my dog. Unfortunately, the stimulation is not right outside my door as it was in other countries.
As for owning a new house and the headaches as one poster mentioned, it really isn't so bad. I paid for the house in cash, so all that is needed is the insurance and property taxes, and they are taken monthly out of my bank account. It's less, much less, than rent. Yard work in minimal, and I believe the maintenance is no more of a headache that a condo or getting the landlord to fix something in a rented apartment. Will I sell the house in a couple years? You bet. I like the idea of age restricted condos, fully aware of the pitfalls with condos also. Renting an apartment just doesn't seem right. I know some of you do it, and I know it works for some of you, but for me, I'd hesitate traveling much knowing that I'm still paying rent on an apartment that's empty.
I'll make the best of a new and challenging situation. Thank you for all your advice and encouragement.