How do I look good for the upcoming trip?

Okay, so this is kind of late for you, sorry, but I'll put it here for people who might want to get some tips from your question, or maybe for you in the future:

I lost 11 pounds in two weeks with a variation on the South Beach diet. Technically you're supposed to buy meals from them, but I just took two weeks and cut out all excess carbs. No candy, no bread, no fruit, no pasta, no chips or fries. Two weeks. Lots of salads, lots of vegetables, all the meat you want, but no excess carbs. Now, I've been going for a week with just having those carbs at one meal a day and cutting them out for the other meals, and I've lost an additional pound this week.

I've also been getting some more exercise...just additional running or walking each day, nothing too dramatic. It's a healthy way to lose weight and it's very effective. You'd be surprised how many extra carbs you eat and how well you can do without them!

I would recommend trying to eat as healthy as possible and work out as effectively as you can until your trip (and afterwards too if you find yourself in the groove :D) I wouldn't recommend focusing on losing a certain number of pounds before the trip because if you don't meet that goal chances are that you will be hugely self conscious and end up not having as much fun if you just focused on making yourself feel and look better!

I also recommend the most important stretch of the day! The smile stretch :D! With you beaming with that brilliant smile of yours and the healthy glow of good fitness and nutrition, you are going to be the main attraction ;)