Minecraft wiki entry for The_second_day, associated text: At this stage, creepers are deadly. Run away until they despawn or lose track of you.
Skeletons and zombies may survive in water or shady spots; lead them into the sun and avoid them until they burn to death, then collect their drops. If you're unlucky enough to encounter a husk, armored mob or a baby zombie, run away from it until it despawns or loses track of you. Remember that baby zombies are faster than regular zombies, and skeletons are generally smart enough not to be lured into the sunlight.
Spiders are neutral in the daytime, so you can avoid them; if one has targeted you, lead it into the sun and run it around until it loses interest. If you are confident, this is a good time to perform a surprise attack on them and get a few pieces of string. Attacking a spider doesn't anger other spiders nearby, so you can safely track each of them down.
Endermen are neutral unless you look directly at their face, so avoid looking at them at all costs. Remember, they could kill you with ease, so you'd better stay away from them at this stage.