For a day by the water with a difference, organize an outing to the bubbling pools of Sabeto Hot Springs and Mud Pool. This place is known for its mineral-rich thermal waters.
When you've finished at this naturally heated water source in Nadi, why not check out Namaka Market, Wailoaloa Beach, and Garden of the Sleeping Giant? They're not very far from Sabeto Hot Springs and Mud Pool and also popular with many travelers.