Cape Town!!! It's got a very California feel, but the weather is even better. It's laid back, has a vibrant boho community, and people are really into health and fitness. Plus it's beautiful - it's got the mountain and the sea. That's where I'd go.
San Diego would work well too, but the American visa is a nightmare to get.
Barca is super cool, but mostly art-music-party driven.
"I think the basic anti-aging diet is also the best diet for prevention and treatment of diabetes, scleroderma, and the various "connective tissue diseases." This would emphasize high protein, low unsaturated fats, low iron, and high antioxidant consumption, with a moderate or low starch consumption.
In practice, this means that a major part of the diet should be milk, cheese, eggs, shellfish, fruits and coconut oil, with vitamin E and salt as the safest supplements."
- Ray Peat