Pondering a long walk.

So, I've been thinking about doing the Avon 2-day breast cancer walk.

Pros:

• It's an issue I care about; my grandmother and great-aunt both died of breast cancer, and I know several other people who've had to fight it.
  
• Walking is good. It'd be a good preliminary test of what I'd have to do to walk to Santiago.
  
• It'd be motivation to keep at my regular workouts.
  
• It could be fun.
  

Cons:

• I'm not convinced that even by May I'll really be in shape to walk a marathon one day and a half-marathon the next.
  
• I'd have to hit up people I know for money, which always makes me feel oogy. (You have to raise a minimum of $1800 to participate.)
  
• It'd eat up the one weekend in May that isn't currently occupied.
  

Comments? Thoughts? Encouragement? Discouragement?