How embarrassing, I think I just found the answer to my own question moments after posting
The back page of the manual has some clarifications. It looks as if that tourist eating is in addition to the normal amount of tourist eating. So in this case I believe the baby dragon would eat 3 + 1 or a total of four tourists. Furthermore, if there is only one tourist at the resort, he (she) would eat that tourist and then proceed to thrash my tiki hut.