Beaching Issues

My parents live within walking distance from the beach. It'd probably take me at most 30 minutes walking from our house to get there, and I've been considering doing that but:

1. I can't swim in those beaches because they are quite polluted. So I'd have to walk there to get some sun, hang out, and walk back, and shower at home.
2. My old friends are busy, not in town, or have left town forever. How long could I last without swimming?
3. It could be very, very dangerous. I don't know what areas are safe to walk through. I'm still dazed and confused, and I'd be walking around by myself with no cell phone. And there's seriously high crime awareness in this area.

That feeling of danger is very prominent. It's a really lousy thing that if you've made any money you practically have to protect all your valuables (camera, smart phone) and not take them out in public. Here you really feel like you can't trust anyone, not even the police. You look around and every residence has walls 8 feet high topped with an electric fence and bars on every window, and nobody walks anywhere for fun. You see very few people on a bicycle, even if the streets are flat (in other words, perfect for riding a bike!). I'm trapped in my own home.

I'll wait until the weekend until more people are free to go to a swimmable beach and have some fun all day. In the meantime, I'll stick to the swimming pool crashing at my aunt's house.