I really want to go hiking with my family tomorrow, but I am so sick I feel I don't have the energy or I might get the others sick. Should I go?

NO!!! Not only do you risk spreading your germs amongst your family, you also risk making your infliction even worse! Trust me, one year, I started with a simple head cold and it eventually turned into Pneumonia because I didn't take it easy. Don't be me; stay home and allow your body to heal. Best of luck to you.