Doors. I would have doors open themselves, either because my phone is near the deer and my keys are nearby, or an implanted RFID chip. Or anything. Just a way for doors to open quickly and silently, to just the right amount. Not too much, not to little (it would depend on the situation).
I do not believe that this is a viable alternative to QR codes because it most likely needs a database to store each snap tag. A QR code encodes the data into a 2D image. This means that I can scan a QR code without internet access, and without any downloads other than the scanning app. Snap tags most likely need to call home to get the relevant data.
Try solving riddles, mathematical problems, etc. That might help to get you into the right frame of mind. Don't shoot fish in a barrel, try to think about a problem at first. What is the problem, what are you trying to solve? Now, think of the approaches to solving it. How do you get the answer? Then fool around, and twiddle with things until it works. Try to separate problems into types of problems, each type requiring a certain type of solution, and fit you problem into these lists. Just my two cents.
You could give someone you're password (in your will) and hope that they update the credit card info. Otherwise, the account would most likely be closed due to inactivity.
I do not know any company's policy on accounts that are too old.