One vote here for the Igloo. We pack the bottom with blocks of ice, then jam in a bag of cubes hoping that the cubes are "sacrificial" meaning they melt between the time we load it and launch (often 2 days). We also use the foil backed bubble wrap (hardware stores for ducts) and place 1 layer over the ice. That keeps the ice and such separate from the food, so the food doesn't fall down between it (as it melts). Then 2 layers of the same stuff over the food. Works great, have had great luck even on Main Salmon trips where it was 100+.
Have a blast!
I am a river, babe - I've got plenty of time, I don't know where I'm going, I'm just following the lines..... - "We are water" by Shaye