Well, at least it's not raining.
Try this quick idea:
Play out all mices' coloured player cards.
Draw cards for mice. Must draw enough cards to move mouse at least one square before not drawing.
Gather up all cards and reshuffle into draw deck. The swapping cards among players (just you) doesn't work here.
When all mice moved or stopped, then rearrange coloured player cards so mouse in last position will be drawn for first next bound. Gather up all cards and reshuffle into draw deck.
If a mouse arrives at the dragon square without an item, dragon eats him and he's out of the game.
If a mouse arrives at the dragon square with an item, dragon is defeated, go to scoring. Leave the journey cards on each mouse player card.
1 per mouse still alive (max 5).
1 per mouse not stopped (max 5).
X per amount on each card on mouse not dead or stopped.
1 for the cheese (max 1).
1 per item (max 3).