This is pretty easy. Just reply to this email and put your notes about each check-in *below* that venue's name.
Leaving some blank is fine.
You can visit http://lastnightscheckins.com/notes to see your notes later on.
++ Dec 03, 01:07 PM @ Outlook Amusements (MaI5246) ++
++ Dec 02, 07:09 PM @ Microsoft Los Angeles (+OA5001) ++
-*-*- end email -*-*-
Don't forget: http://lastnightscheckins.com/maps/25490185246 has a map of all your check-ins to date!