I live in a coastal town with a home abutting wetlands and I assure you that I am not concerned about tsunamis. I am, however, concerned about the storm surge + already saturated ground + full moon + high tides combo which does reach noticeably higher highs now than it used to, as I can now watch the tides come and go in my backyard at certain phases of the moon during wetter parts of the year. The water table keeps creeping up, and I'm probably not going to die in a flood, but the septic systems in my town may no longer be viable at some point in the future, certain roads are regularly underwater at full moons, basements flood, property gets damaged etc. These things do need to be planned for. I need to consider the potential cost of rebuilding/lifting my home to flood code, altering the drainage system around my property, rising flood insurance/home insurance costs, etc. when planning for retirement. (This past weekend my basement was flooded AND the skies were full of smoke from Canada so we had both ends of the apocalypse).
I live on the coast and I am a reasonable driving distance to mountains, but the reverse scenario the OP is planning may be the better call...except that VT (mountains) has also had horrible flooding in the past few years, so...I do feel like all bets are off wrt climate in the next 50 years.
Anyhoo, in response to the OPs question, I spent a summer in Monteverde, Costa Rica one year (small town, nice climate but definite rainy season) and enjoyed being in the mountains/cloud forest. I was theoretically close to the coast, too, but with the road conditions it did take quite a while to get there. That was about 20 years ago, so maybe the roads are better now?