Groundspeak, please reconsider your decision.
API access for GSAK (and other 3rd party applications) will only enhance the Adventure Labs experience.
One of the main issues I have with the official application is that when I am doing one adventure, I have absolutely no idea if I accidentally passes a location for another adventure.
This was where GSAK helped me out, gathering information about all the locations in the same way as for multi-caches.
I could then plan my route, but I still had to use the official app to do the adventures.
So once again, please reconsider the API access decision.