I searched the forum for this and didn't see it so....
Well first off, you need a simple macro, make a new macro, name it whatever, now add
/sit
/stand
over and over, you should stop at 252/255, which is what mine stops at.
Now, get on the tram, wait till you get to the water part, make sure your facing the glass, begin to run and spam the macro for about 5 seconds, it'll appear as your lagging, after 5 seconds stop the macro. Make sure when you do this your facing glass. If you did this correctly you should be in the water. You can do this for both sides, there's nothing much but a gnome, naga, nessy, and some sharks. Only the sharks are attackable, maybe the gnomes if your horde. You can walk right through the glass if you want to get out.
Now make sure you're still on the tram when you spam the macro, hit your run key right before you spam the macro, the tram HAS to be moving and you HAVE to be facing the water tank, if it appears your lagging as you spam the macro, that means its working, dont let go of your run key and dont stop clicking the macro.
That's about it