Depends, do you like to to build with unlimited materials, health, and flight or trying to fight of monsters whit whatever you can find Sometimes what I do is I make a fort in creative and switch it to survival (press esc and click on creative or survival to switch to the other)
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The 3 existing modes on minecraft are adventure, survival and creative.
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Build the map on Creative Mode then go to seedscope.net and upload your level.dat for the map on the Change Survival to Creative option. You should then download the new level.dat. Replace it with the old level.dat and when you start Minecraft, you should see that it is now a survival map.
In survival you use a piston but in creative you just break it.
You can use a crafting table in creative mode just as you would use it in survival mode.