The bombs are being dropped in Afghanistan, not Hawaii. Take your trip and have fun... stay longer if you want to.
Living in fear is pointless. What are you going to do in 5 years? "Oh I'm set to travel to Hawaii Wednesday but we bombed Afghanistan 5 years ago and I don't think it's safe!"
Come on man... there's no magic number that determines how many days you must wait after a U.S. military assault before it's safe to travel. Go to Hawaii... hell... go to that Hawaii forbidden island and be like "ha ha I went to the forbidden island!!" and stuff.
Have fun!
-Warik