Personally I don't set target dates as I like to have goals it is up to ME as to whether or not I accomplish them. BUT I know they work for a lot of people and I DO think it is fantastic to set rewards when you reach specific targets. LOL I usually do that but here I am at almost my halfway point and don't have a reward set up for that.
But I DO have in mind a HUGE reward... another cruise!! -- when I reach my goal weight!
Go for it!!!!! I wish you the best of success.