The trouble with rocket-powered roller skates is that you can’t steer.
To remain on land as long as possible, we suggest you start in northern Siberia (99°1′30E 76°13′6N) and point yourself due south. That’ll take you through 4,717 miles of Russia, Mongolia, China, Burma, and Thailand before you splash into the South China Sea.
Or start at 48°24′53N 4°47′44W in northern France and head east. An unswerving course will take you through Europe, Ukraine, Russia, Kazakhstan, Mongolia, China, and Russia, covering 6,665 miles before you hit the Sea of Okhotsk. Good luck.
If you want to be really, really alone, head for 48°52.6′S 123°23.6′W in the South Pacific Ocean. That’s “Point Nemo,” the point in the ocean farthest from any land. You’ll be in the middle of 22,405,411 square kilometers of ocean, an area larger than the entire former Soviet Union.
The point on land farthest from any ocean is at 46°16.8′N 86°40.2′E, outside the Chinese city of Urumqi, in the Dzoosotoyn Elisen Desert. It’s 1,645 miles from the nearest coastline.