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All of the smart stuff has already been said lol
Use whatever you can afford to pay back and don't worry about it.
Enjoy your vacation!
Whatever you do though, make sure you let the CCC know you're leaving so you CAN actually enjoy it.
If you are going overseas, choose the card with no FTF. If you have a travel card, use it for restaurants/hotels, etc.
Other than that, ignore utilization. I went last summer for six weeks and ran up my CSP approximately 50% but didn't care about it. It was paid off as soon as I got back. No biggie.
I say use the cards with the latest statement dates so you'll have the most time to pay them off before the statements hit.