Mmkay, I tried out your map and it is very nice. I just found a few things you could change to make it really good.(not saying its bad, it's actually quite good...especially for a first.
First, you definantly need to do something about the "Massive Concrete" texture, as the wood is wayyyy too big.
 
Next thing, was this tree growing at a 90 degree angle, out of the side of some wood...? I would definantly do something about that.
 
The last thing, is on the building, you have wood textures, but with the same metal bumps. I would defiantly null those out.
 
O ya and one more thing. The seawall gate idea was mine first 
 
 
Definantly do something about those first 3, and you will have yourself an awesome map.
Formerly known as Limpmybizket.