Hey man I have had plenty of experience with relationships and with making women happy. Here are some tips.
your halloween Idea is great You are never to old to dress up expecially as a couple consider Dr. and Nurse, or Banchee and Ghost, or Matching Pirates (thats what me and My girlie are doing this year) I was actually thinking the same thing recently that I wanted to do something special so I got us tickets to go to a party on a boat that will go on a halloween cruise. Depending on where you are this may or may not be an option. I suggest that you research what is going on in your area, check myspace... HA HA. no seriously find out what interests her, Does she like nature, music, romantic dinners. Take her somewhere senic, get concert tickets or tickets to some sort of underage rave or other halloween event, go to a pricey romatic dinner at a place that won't card you when you order a bottle of wine. Don't be afraid to spend money this is part of being in a relationship eventually she will spend money on you too. and your efforts will be reciprocated. I wish you the best. Have fun