Seed: dSUg6C4tLe
Back in the day I was hunting for a seed with a really big plains biome, when I eventually found this. It has a double maypole location northwest from spawn, just follow the coastline. In the world generator it shows as a single maypole, but there are two right next to each other, with a 3rd on another island you'd need a boat to reach.
Additionally there is a fairly big mountain not too far from the double maypoles, makes for a really nice starting base location right on the coast, though it needs some terraforming to work well.
Then there is a huge plains biome some distance to the east and a bit north from spawn, I built a big 2nd base there right on the edge of one of the mountains, close to plains and meadows both.
I really like this seed, but you should enjoy sailing to a degree.