An epic 256*256 map not finished to see with the Editor

There's a map I'm working (yes, sometimes I work) on called "The lake's valley" :

·It will be between 6v6 and 4v4 players ( 2teams )

·The island will only be accessible by portal, and to escape you'll have to buy a ship at a goblin's shipyard

·It contains very powerful monsters

·Some monsters are just near the portal's destinations

Please help me to find extra ideas.
THE MAP IS NOT FINISHED AND NOT STILL PLAYABLE
Download it below :
Qui-pique.w3x

·Updated June 05 2006

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I did it today.
Please, would you suggest me some ideas ?