Keep an eligible catch
Use Standard Lure for an endangered catch such as Bowlfish. Inspect a held fish with F before selling it, then carry a suitable catch to the Tourist.
- Find the seated man wearing yellow floaties beside a beach rock.
- Complete his fish exchange and collect Take Carrot [E].


Get the next coordinates
- Select Carrot on the rod, reel in Pufferfish and defeat it.
- Pick up Pufferfish Fin with E and return to the Tourist.
- Collect his Flash Drive with coordinates to island 4.

Optional cooking detour
Catch Blue Shark with Standard Boss Lure and complete the grill-master request for the lighter. The Tourist’s Fin exchange remains the route onward.
Sources and further reading
Third island Swimsuit guy quest (One of these endangered creatures would be cool) - How to Fish Game