Tarentula migration? Wow, just reading this gave me the chills!
I never lived near an ocean (thats what sea level means right??). Here there's a river in front of my house and we do have smaller rivers close by. There's also a lake less than an half hour away. It would be cool if the river would freeze in Winter so I could skate in it but the current is too strong. The lake do freeze but not completely so I never dared try to go skate there, there's probably no danger since a few people fish there in Winter with their little houses they bring there and there were never any accident but I'm too afraid, some even fish near the water that is not frozen.