Whenever summertime comes around, I think of travelling and vacations...
There is no better time to travel than during summer, when the weather will be 70% agreeable and it means less to pack and fuss over!
One thing that I think people travelling within North America should realize (and I think mostly everywhere) are the travel restrictions for carry-ons. Nothing can kill you travel happy mood faster than TSA giving you the evil eye over your non-compliance with their carry-on rules. You'd be surprised how common it is for people to get the restrictions wrong....