It is hard to compare the two trips as they covered two completely different areas of interest for me as well as being very culturally different. Both trips gave me what I was looking for.
The Hawaii trip was always planned to be done at sometime to see the observatories. I remember thinking about doing it back in 1997.
Libya / Egypt was never thought about until very recently when I developed a interest in Military History. Libya / Egypt also included a large general history content, lots of ruined cities and mummies, which I enjoyed, though not of a primary interest.
Must start planning for the Siberian eclipse next year.