This might be what you want to do:

<span class='standouttext'>Spoiler : </span><span class='spoiler'> 1. Use the teleporter and go to the 1st island
2. Drop one of your pyramids there
3. Use the teleporter again to go back to where you started
4. Use your other pyramid to get back to where you dropped the other one
5. Use the teleporter on that small island. </span>