Whenever you complete a level, go to the water directly next to where the boats go in and out. Dive all the way to the bottom and you will see a 1-Up Mushroom. Whenever you return from a level or start from the beginning, it will be there.
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Go to the island where the man is stranded and spray the fire. A 1-Up Mushroom will appear.
Anybody that gives you a blue coin the first time you wash them off, or get them fruit, will also give you a 1-Up if you wash them off or get them fruit again.
There is a manhole near the fruit stands near the lighthouse. Hop in it and go towards the lighthouse. As soon as you have a choice to go towards the water, do so. Follow the path to a 1-Up Mushroom.