I am traveling to Hawaii.Can I use my foreign passport as ID?Will I have to go thru immigration/customs coming back?

You need to contact the airline you will be flying. A valid foreign passport is trip ally valid to board a plane, but other foreign identification may not be acceptable. You should not have to pass through Customs and Border Protection on the return as you are traveling with in the country. That being said you mr risk of interaction with immigration officials is increased by such travel.