You have to pick:

Is this _all_ that I can eat? Or is this more like "congratulations, you've won a lifetime supply of free bread sticks!" And I can just go somewhere else if I want to eat something else?

chances are you get alot of water

Well, you could raise an island from the ocean floor if need be. But it occurs to me that the literal reading of this specifies a "patch of land", so it makes sense that the random location would not be in an ocean or lake.

I found a website that serves up random locations on Earth and kept clicking until the first one that was on land. I got a spot just inside the northern edge of Bandingilo National Park in South Sudan. Looks like a pretty nice place, and not too hard to get to (I'd hate to have hit a spot in Antarctica or the heart of the Sahara or something like that). The local political situation could be a bit tricky, though, South Sudan is wretchedly poor and wracked with civil war. I'd probably want to keep a low profile.

I think that the bread sticks are the only thing you can eat. But they're unlimited....