I know that everyone will be so excited to be at Kumoricon this year and well, some of us might loose our judgement on the way to the hotel, so lets just remember to have common Curtiousy at the convention.
There might just be people staying at the hotel (Bless their hearts) that aren't aware there will be 1000+ cosplay-clad anime fans there too. So if you get a weird stare, just smile back, don't be rude. :] If they ask you about what's going on tell them, it's not like they're trying to sabotage anything... they just chose the wrong hotel. xD Also be curtious to children... If you don't think you should be wearing something (reavealing, ect) then don't.
Also, please try to clean up after yourselves in your hotel rooms. I remember last year I didn't leave the maid a tip and... we basicly trashed our room (I know have a very guilty consence about it).
And taken (from what I remember) from last years con bok, try and be quiet in the early hours, some people might not share your entusiasm at 4am.
oh yes and...
Shower.Seriously looking to impress girls? Shower. Everyday.
The con will still be there when you get back. :]
Ayone else have anything to add? I think we should all be polite to the hotel staff. xD