Harbor Seal
Harbor seals are not uncommon in the winter, but kayaking is, so don't expect to encounter them when you are out for a paddle.
-- Wikipedia
Common Dolphin
On the other hand, the Common Dolphin prefers warmer weather, and can be seen all through kayaking season. They go south for the winter.
-- Wikipedia
These are some mammals you are likely to see in and around the water.
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Bluegill Sunfish
There is scarcely a body of water in the state that does not have Bluegills in it. Bluegills get to a foot long, but are seldom seen at that size.
All sunfishes are aggressive and territorial. Their belligerence is heightened in the confines of an aquarium, where you may start out with several small ones, but you will end up with just one big one. A sunfish will tear a fish-store cichlid to pieces. They adapt readily to regular fish food, but lose most of the attractive wild colors.
-- Wikipedia
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