how to make a crysis map

Can you guys tell me what program you use to make maps and then gimme a few pointers, ive always wanted to make 1 i just dont know how to start

I use the crysis sandbox editor that come with orgianal. Although many ppls i have heard say it ONLY works on vista and XP 64 bit. i say to them fight the oppression and muck around as i did and i found a simple way to use it on normal XP. JUst right click on its icon and click run as ur user and type password. ANd hey presto it worked. And from there i used tutorials on internet. i mostly muck around with physics though like pile of barrels miles HIGH!

where can it be found? btw i only have vista 32 bit

It should be fine with 32bit and it is found on your crysis cd in the sandbox 2 folder just run the installer.