I spent a good deal of the last test trying to figure out what the giants want in terms of donations. Sure, I can do that by (expensive) trial and error. But - am I missing something? - it might be even better if the giants gave clues. So a giant that really valued mining might say, "Nice asparagus, Plurp, but what I really want is metal." Or, you know, some such.
As they currently exist, giants remind me of bad relationships I've had, in which my partners would tell me, in some detail, what I did that they didn't like, but would give me no clue as to what I could do that would please them. I was not a fan of such relationships.