In the far southeast corner of the map is a terrorist base. Guarding the entrance is a terrorist who claims his friends inside have gone berserk, and is trying to keep them from escaping the building. On day 25 onward, he'll have run out of strength (As in, he will die. Don't think you can heal him after you loot the place either), and you'll be able to enter. If you have Carpenters or a Support-type Stand, you can heal him for -2 bad karma, but you won't be able to go inside.
If you don't want to wait to get the items inside, you can kill him, but you'll get a large amount of bad karma and a hit to your entire party's FP. Killing him before day 19 or after healing him will result in FP -2 and bad karma +8. Killing him from day 20 to day 22 will result in FP -3 and bad karma +9. Killing him on day 23 or 24 will result in FP -5 and bad karma +10.
On the 3rd floor of the base, there's a boulder that you can break by touching it enough times. From there, you can jump down to the 1st floor, but your party will receive 50HP of damage.
To the southwest, above Sundarbans, there's a town icon that you can enter. You can take a look around, but there are no items to be found, and not much else besides a couple terrorists and helicopters.
On the coast opposite Sundarbans, there's a refugee camp where you can buy recovery items and weapons. In addition, if you have Carpenters or a Support-type Stand, you can assist the doctor in caring for the refugees. One day will pass, and you'll get -2 bad karma and the Junk Bracelet item.