Hi Richard, Welcome to Fishing Reminder
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How old is your grandson? If he is a child, then any calm water will do. Bay, port, lagoon etc. Just use the good old standard prawn for bait.
If he is a bit older with some fishing experience then you might want to look at specifics. But he will probably already have an idea of what he wants to do.
itsaboat mate...Life is just a boat and then ya marry one !