It constantly changes depending on where I'm going and what my mood is when I leave. A significant part of my photography life is spent in a studio working on various projects, so I tend to travel much lighter than than how I work at home. Partly because I'm a fan of constraints breeding creativity and partly because if I have a lot of equipment with me I'm just not going to want to carry it around and would leave it in my cabin more than I'd take it out.
I've done cruises where all I've taken is a Q2M, so a fixed lens 28mm, black and white only camera, along with my phone.
https://www.flickr.com/photos/joshgates/albums/72177720295648109
https://www.flickr.com/photos/joshgates/albums/72157719575136290
I've done ones where I've only taken a 23mm (35mm equivalent) including one where I had a brain freeze and left it in JPG only for the week
https://www.flickr.com/photos/joshgates/albums/72177720298744134
https://www.flickr.com/photos/joshgates/albums/72177720305321819
I've done trips where almost everything was done on my phone because I took too much equipment and I just didn't want to think about it.
A couple weeks ago I took a 23mm and a 70-300mm, mostly to test the 70-300mm before taking it to Antarctica. I did enjoy the extra options that lens got me, but unless it's a more photography focused trip I doubt I'd take it again.
I think my favorite travel kit to the Caribbean, so far, is the Fuji X-Pro3 and the Voigtlander 23mm. It's small, my favorite focal length (35mm equiv), great image quality with some character, suitable for indoor or out, and I love that it's manual focus. I know what will be in the frame before I even take it up to my eye because I've been shooting that focal length so long, and I know how it handles different scenarios.
Have a missed shots I could have gotten with a full kit? Absolutely. Have I gotten shots that I'd have missed because I was changing lenses, not seeing in a specific view, or because I just didn't want to carry a lot of equipment with me? Heck yeah. For me, the lightweight and single prime lens kit is the right choice, but everyone's got different priorities 🙂