To obtain the Missing: Pablo lost and found quest in Dead Island 2, interact with the missing board at the Serling Hotel during/after The Search for Truth story quest. Afterwards, read the journal to learn that he was last seen wearing a green cap and VCLA Bobcats jersey and was on his way to the stores on Venice Beach to look for some protein powder and needles.
For the needles, travel to Roses Tattoo parlor.
You can find this by traveling to the spot shown in the map below.
Once you arrive, push the switch next to the door to raise the shutter then head inside. Interact with the Need for Needles journal next to the locked chest behind the counter. The journal mentions two places: Muscle Beach Nutrition and Gang Whatsitsname.
Next, make your way to Muscle Beach Juice Bar.
You can find this store by traveling to the spot shown below.
To open the blue garage doors around back, you’ll need to find a circuit breaker to place in the box in the alley along the side of the Muscle Beach Nutrition building. We found these boxes at the below locations!
Once you’ve place the circuit breaker into the circuit breaker box against the building, head around back and press the switch to open the blue garage door.
Head inside then collect the Protein Please journal from the table near the front of the store.
This journal will mention two places: Roses Tattoo Parlor and Doc Marin’s Green place. For the last stop, head on over to Gang Green (weed shop) which you can find on the northwestern side of the area. You’ll find Doc Marin out front having a snack.
Take him down then retrieve the Gang Green Gate Key. Head around to the back of the store then open the gate.
Disable the trap then crouch through the opening to enter the store. Once inside, watch out for more booby traps then loot the High Stakes journal next to the corpse. Afterwards, the quest will complete and you’ll receive 2,000 XP and a Fire Axe.