Ditto on the Adventure Medical Kits.. I have the Comprehensive and it is
pretty much stoked to the gills. Retails about 100.00 or so but REI sells
them a couple times year way below that. (thats where I found it).
Also Outdoor Research makes kits of all different sizes although not filled.
One idea is to go to REI with a digital camera and take a close up of the
back of an adventure medical kit (they all have the contents spread out on a
table and pictured as well as a checklist) and then go home and look it over
and decide what you do and dont need specific to your area..
Coming from a job that requires advanced trauma level training with the idea
that help is a while away I would reccomend carrying a bee-sting kit. The
drug in those things can save peoples lives in alot more ways than just from
a simple bee sting...  Obvioulsy just having the kit and not knowing where
everything is stored before the accident is not good... and finally..
although 'first aid' kits are good they mostly deal with comfort items. They
do have rubber gloves so that's good and the more advanced ones have the
handy cpr mouth seal (really a puke guard). But other than that the really
life threatners are mainly treated with common sense until you can get the
person to safety..
But comfortable is really what you are after anyway.. you are on vacation!!