Originally posted by ApocNizmith:

Best Seed to ever exist: HHcLC5acQt

Trader, all biomes, and all bosses can be accessed on foot alone.

+1 for this seed, using it in my current game waiting for mistlands to leave PTS

Just south of that main starting continent, there is a pair of small islands separated by a river, that consist of plains and black forest and make a great spot for an end game base. The islands are small enough that you can easily spawn block one of the islands, while leaving the other to spawn plains creatures nearby in a controlled fashion.