My experience with the US customs and immigration for vacations has been fine. Just have the details of your trip in your mind if asked (cruise, etc...) and no problem. I've had issues with them going into the US for work, but not for vacation.

Personally, I find the YVR Canadian immigration folks pretty poor - very suspicious on my returns (I'm a Cdn citizen) since I do solo trips fairly often.

Have a great 50th in the sun and warmth.