Mezonoth Outside The Sukka

If I go on a day trip with my family during hol hamoed succoth which involves going to remote areas where there are no succas must I avoid eating mezonoth or hamotzi?

When one goes on the type of day trip which you describe one would be exempt from needing to eat in the sukkah, during the day alone assuming your trip is only during the daylight hours.
See Rambam, Hilchoth Sukkah, Perek 6, halacha 4.