I would avoid coastal communities. Wealthy beachfront owners will likely find a way to socialize their losses, either by getting taxpayers to fund coastal armoring or via direct bailouts. Alternatively there is the risk that property in those areas becomes uninsurable and by proxy unbankable. Hard to predict which way it goes, probably will depend on the individual community.

Probably better to buy cheap arable land somewhere in the north that is projected to get warmer and has access to lots of water.