If you're tripping with a large group, it's best to divide up responsibilities between people. It just wouldn't be fair to make one person do all of it while everybody else just has fun the whole time.
So divide it into equal teams: these people are earlier risers than the rest, so they can make breakfast every day. And these people are really good sandwich makers, so they can make the lunches every day, because we'll be going on picnics. And these last people really know their barbecue, so they can do dinner in the barbecue pit.
In essence, make sure to divide up the time: it's a vacation for everyone, not just two or three people.