Hi Carolina, and welcome to the Disney Parks Moms Panel! I just love it when a fellow Floridian stops by to visit!
The Florida Resident 3-Day Discover Disney Ticket is one of the best deals going, isn't it? Sadly, though, these tickets are non-transferable once they've been used, so you won't be able to gift your husband's ticket to your friend. I just phoned Guest Relations to see what your options might be, and the Cast Member suggested that if you won't be able to use your last day before it expires on June 5, perhaps you could upgrade to Florida Resident Annual or Seasonal Passes.
It's worth a call to Walt Disney World Guest Relations to see if this could be an option for you. The Cast Member I spoke with said you can call (407) 566-4985, then press option 5, to upgrade. Otherwise, maybe you can get in a quick visit with your hubby before June 5.
Sorry I didn't have better news for you today, Carolina. I do hope you'll come see us again if you have any more questions. We love to help!
Have a magical day,
Kathy K.