Your absolute best bet with windows is Club Soda! It does an awesome job and is, obviously, super cheap. It doesn't matter if it's flat or still fizzy either. Just pop it in a spray bottle and use it like you would windex.
As for your hardwood floors, two of my three books on green cleaning recommend a 1:1 ratio of distilled white vinegar (heinz brand honestly does smell less than store brands) and water with the option of scenting with a few drops of essential oil. With this solution you have to rinse the floor afterwards with plain water. The third book recommends 1/4 c vinegar for 1 gal water and I'm sure you could add a few drops of essential oil to that also. I don't think this would need rinsing since it's a lower ratio of vinegar to water. Make sure you dry-mop excess water off the floors afterwards so the moisture doesn't sit on them.
If you'd like more homemade cleaning recipes, feel free to contact me. Enjoy your party :O)