Go Take A HIke!
First I want to congratulate the autors of this amazing and fun game!
My doubt is: everybody has 3 cards in hand to chose 1 to use, right? After that, for the next round do you discard all the 3 cards you had, including the one you just used and get 3 new cards or do you just draw 1 card so you have 3 cards again, from wich 1 is new and the other 2 are the remaining cards you did not use from the round before?
Just draw one to fill your hand back up the your max limit again (one player may have 4 if they possess the special treasure card). If you lose the special treasure card during the round, then you don't draw one on your next turn leaving you with three.
Hope that helps.