Good luck on your plans, Julia, sounds like a great adventure in the making!  
  
I can answer one of your questions: the Brennan Recreation facility(public pool/skating rink) charges a buck for a shower(ok, the website actually says "$1.14").  It's adjacent to the campground, too, if I remember correctly.   
  
link:   recreation centre webpage 
  
Have fun!  Maybe see you there this summer...(on the rocks, not in the shower ) 
  
Sherri