One of the most important factors in our adventures is our information. We love our local library and get many great books there. They have a ton about oceans. We also use the internet a bunch. There is so much information! It is a lifesaver when Ollie asks a question that I don't know the answer to.
After our adventures with preschool co-op, we started by studying octopuses. We read up on them quite a bit. Ollie was fascinated by the way they escape prey--hiding, running or spewing ink. He was also interested to discover that an octopus's mouth is inbetween all of his tentacles. We made an octopus by stuffing an old sock with plastic bags, then tying a string under them and cutting the "leg" of the sock into 8 pieces, such a great exercise in counting! Here he is with his octopus. Of course it was swimming so it's a bit blurry!
Here I drew an underwater scene in white crayon on white paper. Ollie then painted it with watercolors to discover what animals were there. I do say, if you do this, be sure to really color your picture in thoroughly or they won't be able to tell what is there. Ollie did enjoy this but kept telling me that the shark was a dinosaur. I guess my artistic ability has never been fabulous!
I borrowed this idea from a great little blog that I love called Discovery Days and Montessori Moments. She recently had her child create a winter scene with little plastic animals and white playdoh. I had Ollie create an underwater scene with some plastic sea animals and blue playdoh. He enjoyed this and it morphed into a long fun experience. Not only did he create a scene but he hid them in the dough, he made prints with them and he decided to make an urchin as well. We played for probably an hour. Our sea creatures interacted and it was quite amusing.