Maybe Maine already has this, and I'm unaware of it.  But move over indoor trampoline parks...would someone PLEASE bring indoor surfing to Maine!!  This video is of my son on a trip to Florida.  If Florida can have INDOOR surfing...then  get in the game Maine!!  

Imagine on a cold winter day going surfing!  It's warm!  It's fun!  It's not snow!  A nice way to escape the dreaded Cabin Fever.