If you are looking for ideas on how to go about a map, you can check out these two forums.
The first one is the one you are in, have a browse around, and not just the first few pages, but skip a lot and head into the thirties and forties. A lot of good ideas that have never been made as no one had the skill to do it. Another one to look at is the recycling box. viewforum.php?f=242
Less ideas but these are some way into the process and you can see where others have gone wrong on there versions. If you are looking for a really good idea, look out for the thread from AndyDufresne, some really great ideas from him have been posted after his banana binges.