Photography Tips
Underwater tips:

#1 Shoot in safe waters. Stay out of unpredictable strong undercurrents or aggressive marine life. Be aware of your surroundings and limit yourself to your swimming abilities.

#2: Have enough light. Best time to shoot - bright afternoon. 
If waters are gloomy, use flash or artificial light to bring out colors and take away shadows. If using underwater strobe, position flash at an angle towards the lens to prevent white spots.

#3: Stay at the surface. The coolest effects can be found at the top - play with sunbeams, reflections and backlit texture. Split your frame - half under water, half above.

#4: Get close. Fill whole frame with your subject - gives an impressive effect.

#5: Get acrobatic. Have your friends tumble into the water - catch subject in mid-dive using high shutter speed.

#6: Make bubbles. Try hard plastic straws or water pistols.

How to Shoot Fireworks

1. ISO - Shoot at a low ISO setting, around 100-200. This will eliminate "noise", which can look like white or colored dots.

2. Turn off the Flash - The camera will then capture the amazing lights.

3. Use a Tripod - This will help to reduce camera shake and create stability if you use a longer exposure. If you don't have a tripod, put your camera on a steady surface, like a bench or hood of the car.

4. Shutter Speed & Aperture - Capture the movement of the fireworks by using a longer exposure. Don't open the shutter for too long as it doesn't take much to over expose them. Shoot between f/8 to f/16.

5. A Shutter Release Cable- This is how you can get off shots quickly and continuously. With your camera on a tripod, you can set up your angle and shot to click, click click.