My two cents worth...Buy the biggest/ best cooler you can, then bring lots of ice with you,( blocks last longer) and buy more as needed since you will be at Bullfrog anyway if you were planning to rent freezer space.(not available to my knowledge) Dedicate one cooler to just fish so you don't open it as much and you will have no problem.
There are more "reasonable" priced coolers that hold ice quite well, not quite as long as the one Lake Bum mentioned and the others that were referenced in tests. I own 3 of the brands mentioned (and they are good,) (luckily I got them at the very right price) and yet my buddy uses a cooler that costs a third as much (Got it at Costco) and he uses it for houseboat trips as long as 10 days. He does not have to run to the marina that often to top it off with ice and we bring back plent of fish always in good shape.