In the legal to use anywhere in the US category with minimum licensing involvement and reasonable TX (transmit) power it's going to be hard to beat GMRS. They require a license, but I've read that it is simple and easy to get with no test required. One license per system of radios, not one license for each user. So one license would cover the whole hunting camp. These use pre-set "Channels" rather than frequencies and Privacy Codes like the much lower powered FRS radios.
Read more:
https://www.fcc.gov/wireless/bureau-divisions/mobility-division/general-mobile-radio-service-gmrs
These operate in the 440 MHz band which some ham HT's can also operate on. Using a ham radio on a GMRS "channel" is illegal, but I'll bet it's been done, and more than once.
Next step up in radios and licensing is a ham Tech license. Here each user needs their own license and there is a test that you need to take before you can get the license. This makes you legal to use the 2 Meter and 440 MHz ham bands (& probably others that I'm not familiar with) set aside for ham radios like the Baofengs shown earlier in the thread. The intro of the Baofeng radios has really lead to a crack in the FCC's enforcement. There are 10's maybe 100's of thousands of people out there using them w/o a license. Anarchy of the airwaves, just like what happened with cb's in the late 70's, early 80's.