Just some annoying thoughts on an otherwise happy thought thread:
On a beach are you more exposed to the mercies of weather conditions?
In a SHTF scenario is the beach more defensible or can you be easily flanked from behind and cornered with your back against the sea? Think Pirates. On the rise now, even in our Gulf. Haitians. Cubans. Mexicans. The issue is not racism, just a shift of population when the flag goes up and Uncle Sam bails on us.
I am reading the LONG EMERGENCY. Not done yet, but Kunstler mentions the issues of coastal hazards.
I have spoken with Aussie military personnel. They have a real world mission patroling their coasts. Within a few days you can have a complete fishing village of Asian squatters set up camp.
A lot of prime coastal USA areas also have highways capable of dumping any number of refugees into your small town idealic retreat.
Coastal areas may have some special difficulties regarding farming (lotta sand, cool weather, wind). In a SHTF scenario, a beach retreat would rely on some inland trading partners (perhaps more so than an inland retreat would rely on a beach partner?)
Vacation yes, retreat no.
Simple thoughts from a simple mind.