K2-18b

I'm going to pass on visiting any planet that is 2.6 times the size of earth. That is some crushing gravity. The Pandora's Star sci-fi series has a good description of people planet jumping. They cured jet lag in the book with worm holes, but visiting a planet with higher gravity would be way worse than jet lag and it would take a lifetime to get over it. Visiting lower gravity planets would be a blast as long as you don't stay to long.