Parents? I wouldn't mind since we can compromise (Libra Father, Aquarius Mother). I am meeting them in October on a trip for my cousin's wedding. I've traveled with my siblings (Sagittarius sister, Virgo brother) before and I wouldn't mind that either. I've been on trips with only 2 GFs in the past (Cancer ex, Libra ex) & it was fine. I've traveled with a few coworkers for business trips (Libra boss, Leo boss, Virgo coworker) but I don't really count that.
Best traveling companion(s): my group of friends & cousins that I usually travel with. Closest ones to me are air signs, most of the group are earth signs, 1 water, 1 fire. Went on multiple domestic & international trips with them with no problems (other than some of them fighting with their SOs).
Worst traveling companion: Capricorn friend: total bro, did not plan anything, did not do any research, & totally disrespectful to anything & everything.