Taking a day trip is the easiest way to see many of the islands in Greece. Symi is a pretty small island, so I don't recommend spending many days there. What you can do is take a short ferry to the island and spend it walking around, exploring and heading to the beach. If you're lucky, you'll be able to check out the annual music festival which features artists from around Greece.
Monolithos Castle is a stunning castle that was built in the 15th century and remains until this day. This is a birds eye view of the castle so you can get a good idea of what the ruins look like. The Castle is located in the the village of Monolithos which is about a couple of miles from the city. There is no fee to get into the area and walk around and its open pretty much all day!
Another earthquake hit the waters near island of Rhodes this week, it was pretty small and there aren't any damages or losses on the island itself. Many of the islands suffer pretty frequent earthquakes because of their proximity to volcanic and tectonic plates. The island is prepared for this and takes many precautionary measures. The earthquake was 4.5 magnitude which would usually cause slight damage to buildings but gladly it was in the water.
These are my travel tips from having visited Rhodes a couple of times!
-Don't spend all your time at the beach! It's tempting, but there are some really great sites and an amazing village town that are totally worth visiting
-You shouldn't pay top dollar for a hotel just because it has a pool! Many of the beaches are much better than the pools and they also offer great services like food and drink service.
-Bring your own first aid kit. If you need medical attention, it might be difficult to find a pharmacy that's open. There's usually one or two pharmacies that remain open at night or during holidays. If you don't have a car, it will be more difficult to get to them.