Pieces you need:

 2 large rectangles

 2 arches

2 triangles 

2 small rectangles

Steps:

✔️ Step 1: Place the 2 large rectangles on their long thin side down on the ground about 3 feet apart from each other.

Step 2: Place the small rectangles (armrests) on top of each large rectangle on their long thin side too.

✔️ Step 3: Put an arch down on top touching the small rectangles.

✔️ Step 4: Using both triangles, put them on the ground with their long flat sides together to form one triangle to be the front of the pirate ship.

✔️ Step 5: Place the remaining arch at the back of the ship to be a fun tunnel to crawl into the ship.