| Ok. Make one like this:
Make two rows going up and down, and seperated by two squares of water, going vertical. Make both of the isles of land 2 spaces wide (horizontal) and going up (or down) 5-9 spaces. On one row, make the explosions go up 1 at a time, and the other row make them go down 1 at a time. Then after that make a connection right in the middle of the trap, in the water connecting the two. Leave that space open to camp there. Then you're done.
I hope you got this, because I just spent a whole lot of time trying to put it into words.
-Matrix-
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