New year in Spain

It's the first time I'm going to celebrate New Year's Eve in Spain. I have googled a bit and found some info: wear the most beautiful dress you have (that's not going to work for me since I'm here on vacation), have red underware?? (mine are white and black), eat 12 grapes at midnight.. in about 12 seconds!!!!!!!! If you can eat all of them then it's good luck. Not sure I can do that.. but I will try. =)