Life --> Living itself, eating, self defense, etc all can fall under this
Liberty --> Literally being free (IE not confined), the ability to say what you want, the ability to believe what you want, etc can all fall under this
Pursuit of happiness --> Protecting/claiming an area of land that you like, seeking items that help you to live, etc could fall here
Is that a ton of things? Absolutely. Does the fact that those are "rights" mean people can't stop you from doing them? Absolutely not. Your rights, in nature, are not "protected" beyond what you yourself are able to do to protect them. Right's, in a natural sense, are simply those things all men are free to do and can never fully be taken from them short of death.