Is in the first swamp area (can't remember the name now). Swim left (west...) and you will
have to dive under a log. When exit water, go right and climb the tree. Now, go all the
way along the rope (string, line...) hanging. Your stamina should be full before climbing
the rope so you don't fall off. When above the other rope, let go using X button, and then
grab the other rope using the triangle button. Stamina will recover so go along this rope
and let go when above the cliff. And, there it is. Croco cap.

before your first fight with ocelot look in the lake with croodiles and if u swim to your
left thre should be a dam swim under it and theres land then climb the tree pressing
tringle button then go to your right while on the tree there should be a wire pres tiangle
aND YOU SHOUD BE ABLE to climb the wire then at the end of the wire press x then quikly
press triangle and there should be a wire on the bottom go to your right and there would
be land with a square shape on it thats the croc cap then press x when your on the wire
above land and boom thre it is