I'm not sure what your bike can handle, but get the widest recommended tire. Don't squeeze it in there, because the sand will eat your paint. Once you get even a bit off pavement, width matters more. 28mm tires will roll rather than sink, but it won't be fun. If you hit a muddy patch, it's over. The wider tires will keep you floating above any soft material. Even on a groomed, smooth, hard trail, you'll go a lot faster on a 45psi 35mm tire than a 28mm 65psi setup.
As for the specific tire, you can go with a slick for sure. You want a fast rolling fatter travel tire? I've had good luck with Schwalbe G-One Speed (these are only 30c?),which are just as fast as my 25c GP5K tubeless. The G-One AllAround is a good tire too. My GravelKing 42c are roughly 1mph slower on the road till about 20mph, then a bit more. Vittoria has a nice mixed road tire too.
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