I had a seed where bonemass was ridiculously far away. While sailing there it was multiple plains biome's as I skirted the cost (as well as swamp, etc.), deathsquitos flying out... was quite the adventure. I should have looked for one of the other ones instead, haha. But managed it and setup a portal in a broken down tower, which I later fixed up. It is harsh but that kind of stuff is memorable.