2. Children should automatically see the collectibles. Let them fight over who gets it and let them earn skill points for finding things. They could still go for the mushrooms on their own too.
If kids saw the collectables on their own there would be no point in having bonuses for collecting them because eventaully every single person would have them all without ever trying. The point behind them is to give you something to do when your not actively doing something else. Would you play or "watch" bejeweled if it solved itself. It wouldnt be much fun

Your supposed to go around and pick them up.