Looking at those boats and remembering a game reviewed in a gaming magazine years ago I'm gonna put 2 and 2 together and hope the answer is close to 4. I say 'Heart of China'.
YES!!!!!Its the only game I know of that asks you to go fetch seagull poop (for a Chinese medicine maker to make you some healing stuff), thats why I used DOSBOX to go get that screenshot myself, because none of the screenshots were the Seagull poop dialog online. Who knows though, I'm sure someone here could name one oddly. I can't even remember any games where a task is to get poop in general. But I'm sure I have played one in some humorous game.