Frozen Peaks Beyond a Forest Start With an Ancient City — Java 26.3

Forest start with Frozen Peaks about 128 blocks away and an Ancient City about 204 blocks south-west.

Top-down 2D biome map centred on spawn, with a spawn marker in the Forest and markers for the Ruined Portal, Ancient City and Stronghold.
Java 26.3 Edition Java Spawn 8, 8 Biome Forest Structures 2
Ancient CityBirch ForestForestGroveMeadowOceanOld Growth Birch ForestPlainsSavannaSnowyRuined PortalStronghold
Open in the seed map →
Seed -6953478303655851412

Copy it into Minecraft 26.3 (Java).

The headline here is Frozen Peaks, with the nearest patch about 128 blocks from your forest spawn, close enough to build a mountain base without a long trek. Stony Peaks and a Grove sit in the same stretch of terrain. For something deeper, an Ancient City lies about 204 blocks south-west, and a Ruined Portal is about 200 blocks east. The Stronghold is a long haul at about 1695 blocks, so plan that trip later.

Structures near spawn
Ruined Portal → E 208, 16 200
Ancient City ↙ SW -144, 144 204
💎 Diamonds, open to a cave ↗ NE 26, -10 Y -6 25
💎 Diamonds, dig down ↖ NW -1, 3 Y 0 10
Biome mix near spawn
Forest 28%
Plains 18%
Savanna 11%
River 10%
Cold Ocean 4%
Savanna Plateau 4%
Birch Forest 3%