Don't forget the sunscreen and repellent as you might need it in some places. Even the trail is pretty good, you might appreciate trousers instead of shorts but that part is pretty good. If you want to return going to Praia do Forno, I recommend to take the same way back and then go to Praia do Forno going uphill from Arraial do Cabo. There's only a few point of view but a lot of vegetation that makes the hike complicated.