-After taking something heavy that's worth little, click on the bomb bag to the right of your boat to blow it up so you do not have to wait. The number on the bag will indicate how many bombs you have remaining.
-When your obstacles include big rocks, snare them and quickly bomb them. This will usually clear a path to higher value treasures.
Snare or bomb the puffer fish when they are deflated. If you grab or hit them when they are inflated they will destroy everything around them, including treasure and fish. If there is a group of puffer fish inflated, they will start a chain reaction which can destroy everything of value in the round.
Always buy bombs whenever you can afford to. They are not always offered and are always useful forgetting rid of enemies or obstacles, free the animals in the later rounds, and clear the rope of unwanted items.