Why the ocean? cause you don't need batteries and you get free liquid cooling.
The ocean is huge, this means you can find some really good area. We want an area that
Gather weather data and find the best location that satisfy those parameters
A interesting location is Greenland sea, you can see a cloud mask overlay here
Artic and antartic ocean look promising
North Pole Web Cam 2010 (full length)
Anywhere above the artic circle or below the antarctic circle sun shines 24 hours a day for 6 month.
Midnight Sun in Longyearbyen, Svalbard, Norway
Another example in norther Canada, above the artic circle
Road to the Arctic Ocean, Driving the Dempster Highway to Tuktoyaktuk | Go North Ep 12
Here are some interesting charts with solar irradiation