Spawn on the edge of the forest biome, with a shipwreck right on the surface of the coast. There are two chests inside, one of which has a buried treasure map, and the other contains:
3 emeralds
5 gold ingots
14 iron ingots
23 iron nuggets
The buried treasure isn't too far either -- you will find it at coordinates -71 425. Inside the chest you'll discover:
