As far as I know it is illegal to remove anything from the islands, especially anything living. Add extra trouble if you want to try to bring it into Canada.
But besides all that- I agree with Shipwreck that there isnt much in the way of nice looking macroalgae to bring back. Actually a lot of stuff you find in Hawaii now is considered nuisance and forgien. There are organized cleanups to remove macroalgae from beaches, so I doubt anyone would have a problem with you harvesting it. Its just the trouble of removing it from Hawaii.
I'm not sure about the Caribbean, but I imagine you'll run into problems trying to bring it across the border. You'd be suprised how resilient macroalgae can be.
-Diana
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