Everything on your resume - everything! - needs to support the claim of your resume: I am the person you should hire. It's fantastic that you are thinking in advance about how your actions will look on your resume. All you need to know is that you are the person who writes your resume - it's not an objective recitation of only facts, it's a true story that you tell.
So, right now, you're not telling a good story at all. Barely a few years into your working life, you're "tired" and want to go randomly "take some tours in some cities around the world for some time." If I ever see this on a resume later, I won't want to hire that person. I will, as others have said, worry you will do the same thing after starting to work for me. And having a blank spot - the cake shop job ending in 2016, and now here you are sending out a resume in 2019 with that as the most recent job - is awful too, because I will make up my own story about what you might have been doing, and it won't be flattering.
Does that mean you shouldn't go? Absolutely not. But at some point, you will need to decide what you are going for and what you are going to. Right now, you want to go away from your cake shop job. You may not know yet what you are missing, what you are looking for. But at some point, you will be energized, you will know what you wanted and who you are and all of that. And you will be ready to work again. When that happens, you need to look back at the time away. What was it for? What did you learn or achieve? How did you support yourself? Who are you now? And once you know that, you can write a section on the resume that describes that time in words relevant to the job you're applying for and makes that time part of your true story that shows you're the person who should be hired.
Say you're going to be a baker forever. You travel around the world and eat a lot of pastries. In some countries you actually visit people's homes and learn how to make certain breads or pies or whatever. In others you briefly work in a bakery when you run out of money. You return to your home country after three years knowing so much about breads and pastries around the world, an experienced traveller, and fluent in two new languages. That's going to look amazing on your resume and every bakery in town is going to want to hire you. Now if instead you want to be a reporter, or an actor, or a history teacher, then the parts of the story you put on your resume won't be about breads or pies, they'll be about things you saw and did that relate to those professions.
Many people have times they didn't work. Because they were at university, because they were raising children, because there was a war in their country. They can easily explain their gap. Your gap will be harder to explain. But because you have thought this through in advance, you can structure a gap that doesn't just have to be explained, but that makes you more employable when you return. Go for it!