Any journey across the water usually involves a close encounter. Dolphins love to ride a boat's bow-wave. The pressure wave at the front of a boat gives them a boost. They dive, weave, kick and splash. This gives people a good chance to look at them.
Dolphins are grey above and white below.
If you see one that looks white it is probably swimming upside down. They do this when mating. Man has a long association with this marine animal and there are plenty of dolphin stories. Forty years ago a local oyster farmer shot at a youthful, exuberant dolphin, which was on his lease knocking over the oyster racks. Old 'Cutfin' is still around today.