I don't have a specific handheld model I could recommend. I would suggest going with a name brand such as Midland or Motorola. If you have the budget consider one of the Midland FRS/GMRS micro-mobiles. I've been impressed with the ones I've seen. The range will be significantly greater than a handheld and you won't have to worry about charging. (The GMRS channels do require the purchase of a $70 FCC license to be legal. No test required.)
Check these out and then have a look on Amazon or wherever you like to shop for a potentially better price:
https://midlandusa.com/micromobile/
EDIT: Just to be clear to anyone planning to come, even something like this would probably be fine:
Baofeng (Click here)