It's not hard at all, just do this:
SUPER SECRET QUEST INFO
(highlight the above lines)
Though, with that said, I don't really like seeing step by step explicit instructions given out. It kinda kills things a bit.
The problem is, I can actually read that without highlighting... maybe I just have sharper eyes than you

Mostly, though, this is to do with the two tones of background.
I do agree with yourself and Orielle that the preferred method would be to have hints and not spoilers, however, looking ahead to the likelyhood that spoilers are, at some point, going to be used, the tags would mean that everyone could safely browse through quests for ideas on what to try your hand at next without inadvertently reading a solution.
Of course it wouldn't necessarily need to be a full in depth solution, but perhaps more specific hints, clues or advice than given originally.
Really, it's just a 'try to please all sides' solution
