If you ever run out of space to build, you'll just make space like in the Netherlands. Sadly there is no tool for this in CXL (yet), but I found a way to do it. Three tutorials:
Buildings
This tutorial contains a mod not compatable with CXL 2011 and the problems within could be solved by a different mod (it's in the tutorial, too).
Beach and island-shapeتسجيل or to view Spoiler content!
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Harbor and a partial beach
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Tutorial Make artificial islands
Make an island using waterroads and scenery.