Many of my Second Life friends complain that Blue Mars doesn't have keyboard controls, but after a recent update, you actually can move your Blue Mars avatar with the arrow keys, or classic WASD controls. As Jasmine demonstrates above, all you need to do is go into the Options menu, and in Controls, select "Absolute". If you're moving with your keyboard, you'll also probably want your camera to follow directly behind you; to do that, go into Camera and turn on "Camera Follow". May take some practice to use, especially in smaller, tighter areas. I personally prefer the default point-and-click, myself, but even with the keyboard controls enabled, you can still use that option, switching back and forth as desired.