How about small decks of "adventure" cards specific to a space as if you were questing there.For example The Graveyard space, instead of doing the instruction's space you're drawing a certain number of cards from the Graveyard deck depending on the difficulty of the task.1 for easy quest, 3 for medium and 5 for hard.Put the cards face down and deal 1 card per turn.Of course
those decks would be harder than the main adventure deck.So the more difficult is the task, the bigger is the reward.They could do this for many spaces like the Graveyard, Vampire's Tower, Ruins,Hidden Valley, etc.