Can I delete all files and users (including admin account) without re-installing SL?

I have a 1st generation Macbook Air, running Snow Leopard 10.6.8.  Just bought myself a new MBA, want to sell the old one (privately, not soliciting here).
The original install disks were Leopard.  I bought a family pack SL and upgraded the MBA at that point.  Earlier this year I sold my old Mac Mini (when I upgraded) and included the SL install disks with that sale (stupid of me).
Now I want to sell the old MBA.  Ideally, I'd have a clean install on SL on it, minus all previous files and accounts.  I've done that before when selling old computers, reformatted / erased the HD, then reinstalled the OS.  But I don't have the SL disk anymore, and I don't really want to pay for it just to prep this notebook for sale.
AFAICT, my options are:
wipe the HD and reinstall Leopard (the only OSX disks I have).  Whoever buys it from me would need to upgrade to SL themselves, and from there to Lion if they want.
somehow try to delete all files and users without touching the current install of SL.  I'm not terribly worried about security of what little information is on the MBA (nothing important to me), so I don't mind trashing files and then emptying trash instead of wiping the HD block by block. 
Any ideas for how to do #2?  I can trash all files/folders under /user, uninstall all applications and delete their folders from Library, uninstall all browsers except Safari and wipe the history from that...
Is there other stuff I should be deleting?  plist files, maybe?  I'm leery of messing around too much and disrupting the install of the underlying OS.
Can I also delete the admin account (or rename it "admin" with a generic default password?)?
Any other suggestions?  Thanks.

Trashing files you have created is relatively easy. Getting rid of an account is a bit harder. Trashing the .plist files, etc., that may contain personal info is a lot harder, and there is always the risk that you will miss something.
Best, and easiest, and customary, is to do option #1 - wipe the drive and re-install the original OS from the original disk set. The receiver of the machine can then decide which OS they want to upgrade it to, and purchse accordingly.
The original disk set for that machine should be included with it when it is sold.

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