I've done this many times on random fishing boats to get out to islands around Indo-Pacific. People are always extremely friendly, helpful, and usually feed you plenty because trips often take a few hours.

Day 2 in the US I got held up in broad daylight and haven't been back. There's an aura of public anxiety there, like no one can be trusted and no one trusts you. You just don't get that many other places in the world.