Summer vacation (English)

This summer, my family is going to go Hawaii for vacation.
As I use my enormous airline mileage, the traveling cost is almost zero. (Envy me!)

The problem is the schedule. My family will go back to Japan 10 days before traveling to Hawaii, but I, due to my work schedule, have to fly from Barcelona to Japan 6th July and go to Hawaii just one day after arrival in Narita.
Spending a couple of days in Hawaii, then I back again to Japan for attending the meeting.
After that, again I will go back to Spain....

This schedule kills me, I am afraid.