i've been kicking around the idea for a steam cart, 4wheel bycycle type, with a little trailer behind it.
 although i dont have the tools at the moment to even think of starting to build one.
 Also though about using steam as a energy source, found some great alternators
 at a decent price that have decent output..
 
http://www.windbluepower.com/Permanent_Magnet_Alternator_Wind_Blue_Low_Wind_p/dc-540.htm
 hook a Small steam engine up to them and gear it right, you could get it up to 3200 rpm and get a decent
 charge out of it for a battery bank. Combine that with some solar and wind generators and if you had
 a cabin in the woods you could have all the comforts you needed.