The due date is approximate. The baby could be born two weeks before, or two weeks after. How does your wife feel about you going on a fishing trip right around the baby’s due date?
The only way to be certain about the due date is to ask the doctor about scheduling a C-section or an induction. However, I can’t imagine they would do it early (and would you want to leave your wife on her own with a newborn?) and they probably wouldn’t do it without good reason. There’s no way to delay labor, it just happens when it happens.
When I was expecting my youngest, my doctor gave me the option of making an appointment ahead of time to have labor induced. This was because my first two babies were born very quickly and one of them was quite large. He felt that an induction would ensure we were at the hospital when the baby was born and prevent me from having to push out another whopper. However, the earliest they could schedule the induction was a week and a half before my due date. Without a medical reason, the hospital refused to do it sooner.
Anyway, a fishing trip can be rescheduled. The birth of your child can’t. If you were my husband and you asked me this question while I was pregnant, I’d smack you. :)