Ancient City West of a Forest Start, Stony Peaks Beyond — Java 26.3

A forest start with a ruined portal at 41 blocks and an Ancient City about 278 blocks west.

Top-down 2D biome map centred on a forest spawn, with markers for the nearby ruined portal, the Ancient City to the west and the pillager outpost to the south-west.
Java 26.3 Edition Java Spawn 8, 8 Biome Forest Structures 3
Ancient CityBirch ForestDark ForestForestOceanOld Growth Birch ForestPlainsSavannaPillager OutpostRuined PortalStrongholdBeach
Open in the seed map →
Seed -8903166899802748837

Copy it into Minecraft 26.3 (Java).

The headline here is the Ancient City, about 278 blocks west of spawn at (-256, 96), close enough to reach on your first day. Spawn itself is a plain Forest at surface y=91, with a Ruined Portal only about 41 blocks east for a quick Nether start. Stony Peaks lie about 264 blocks out if you want a mountain base, and a Pillager Outpost sits about 499 blocks south-west. Two villages turn up beyond 600 blocks.

Structures near spawn
Ruined Portal → E 48, 16 41
Ancient City ← W -256, 96 278
Pillager Outpost ↙ SW -368, 336 499
💎 Diamonds, open to a cave ↙ SW 0, 27 Y -28 21
💎 Diamonds, dig down ↘ SE 12, 13 Y -49 6
Biome mix near spawn
Forest 25%
Savanna 13%
Ocean 11%
River 9%
Birch Forest 8%
Plains 7%
Old Growth Birch Forest 6%