Define "hypotermic". If you mean "Teddy could get hypothermia from staying too long in it", I think that's true for most seas...
I'm not entirely sure about where you're going to find a shore where you can't walk into the ocean. Unless you mean those cliff coasts where geting down to the water is a hassle, in which case I understand what you mean, and no, we don't really have those anywhere in our long country.
When mosquitos come around, you can do one of two things. Either slather yourself with mosquito repellant and hope for it to stay effective, or just accept the situation and hope to eventually develop an immunity. I usually go down the second road, it tends to lead to less hassle for me.
ION:
Today I found this. As a Scandinavian, I must call this glorious!