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Sorry anon, you're years too late for being able to catch a ride on a boat, even if you promise to work your way across. Safety regulations are tight as fuck on boats nowadays and nobody is going to risk the fucking they'll get if it comes out they brought on some stranger to do physical labor. Entertainment cruises are a hellish industry too, it preys on bright-eyed young people and bleeds them dry, but there's always more suckers to replace them so you're doubly not worth the risk there. My parents told me stories of friends packing a suitcase full of American denim jeans and selling them to finance months-long trips through Europe, but those days were a wild west that's ended.
If you're going hitchkiking, spend the money you need to in order to cross borders; once you're inside a country it's all easier and you can look for ways to save the money there. Get comfortable going into restaurants at closing time and asking if you can take some food they'd have to throw out. It's awkward the first few times but the worst they'll say is no.