Spawn in the middle of the jungle biome with a taiga forest bordering on the north. That is where you want to go if you're looking for a large stronghold nearby. You will find one at coordinates 20, -1300.
It has an end portal room with one active eye at coordinates -20, 27, -1340. If you want to activate the whole portal you will need more Ender eyes, which you can find in the ocean monument that is located to the east of stronghold at coordinates 800, -1300.