Going to Florida in 10 days and taking my D3100 with me. I'm a complete beginner and start a photography course at college when I return home but I'm after some tips that will help me get some good photos of the dolphins and whales at SeaWorld? I only have the 18-55mm VR lens that came with the camera but I'm guessing switching to aperture mode during the feeding times when the dolphins are up close and then switching to a fast shutter speed during the shows when the animals are darting around the water and jumping in the air will provide the best shots?