To recover the Zora's Sapphire, Link will have to learn to cooperate with Princess Ruto. Jabu-Jabu's Belly is like nothing Link has seen before, and he'll have to swallow his fear to make it through the unfamiliar tunnels of flesh.
Say Ahhh...
Before Link can make the unusual trip through the belly of Jabu Jabu, he has to figure out how to get the deity to open his mouth. The giant needs to eat a lot of food to satisfy its huge appetite, so he would surely open up if he were offered a meal.
Meet the Princess
When Link meets Princess Ruto, she accidently falls down one of the newly-formed holes in Jabu-Jabu's stomach. Link should drop down the same hole to catch up with the Princess.
Higher Ground
Link must carry the princess to a room full of Shaboms and Stingers, and then throw her onto the higher ledge on the opposite side of the room.
Elevator
At the end of the hallway, Link will find a group of Shaboms and another membrane blocking the door. Look at the ceiling to locate another uvula to tickle.