Trying to move turtle object to random location

I'm trying to switch up this method to allow the fish to try up to 4 random locations for its next move. I've tried a few cracks at it, but I haven't figured out a good way yet.

def tryToMove(self):
        offsetList = [(-1, 1), (0, 1), (1, 1),
                  (-1, 0)        , (1, 0),
                  (-1, -1), (0, -1), (1, -1)]
        randomOffsetIndex = random.randrange(len(offsetList))
        randomOffset = offsetList[randomOffsetIndex]
        nextx = self.xpos + randomOffset[0]
        nexty = self.ypos + randomOffset[1]
        while not(0 <= nextx < self.world.getMaxX() and 0 <= nexty < self.world.getMaxY()):
            randomOffsetIndex = random.randrange(len(offsetList))
            randomOffset = offsetList[randomOffsetIndex]
            nextx = self.xpos + randomOffset[0]
            nexty = self.ypos + randomOffset[1]

        if self.world.emptyLocation(nextx, nexty):
            self.move(nextx, nexty)