Google Maps: Kayak across the Pacific Ocean

Type in driving directions at Google Maps from Tokyo, Japan to Seattle, Washington, and you get this:

Notice on the left hand side:

25. Kayak across the Pacific Ocean 6,243 km

...

40. Kayak across the Pacific Ocean 4,436 km

Why don't they just suggest kayaking straight across? Maybe so you can get new supplies...? Gotta love the humor out there at Google.