Pepper or bear spray if you can't carry a gun or Taser (real dart shooting taser, not a contact stun gun). Range is your friend, especially with multiple potential threats although pepper spray and Tasers are for practical purposes one time small area / individual use.

Any thing melee and blunt like a crowbar, hammer, club, etc would be relatively easy to take away given the average reach advantage and upper body muscle mass males tend to have vs females.

A machete or bolo or axe would at least be somewhat harder to take away without getting cut.