If you stay in Preila, you should know that there are not so many things to do there. You can just eat, sleep, swim, sunbath and go for a walk. Although I would advice to rent a bike and go around Preila to look the beauties of Curonian Spit. If you don't like biking, you can join an excursion or go by bus to the nearest villages. They offer more activities and more places to see.
There are only 2 restaurants in Preila. And this restaurants could hardly be named like this, they are just ordinary pubs. But the best thing to eat ir Preila is smoked fish! It is a small town so everybody knows where they sell smoked fish, you can ask. The fish is very fresh and believe me - very very tasty! The best are bream, flatfish and carp. Enjoy it!
If you go for a walk off the beaten paths, don't sit on sand and don't decide to sleep there doesn't matter how tired you are or how the sand feels soft. In some places there are lot of ants! Not all ants can make harm to you and one ant won't make you feel bad, but it is not so nice to feel pain if you get many of these animals on you! :) Once I felt this pleasure... Brrr
It is very nice to go for a walk up the hills in Preila. You will be able to enjoy being alone in nature, beautiful paths, conifers and sand. But don't go too far away from the roads as it is forbiden to walk outside the special paths in Preila and the whole Neringa.
In Preila the only sport activity you can make is biking. It is great to go by bike all around the Curonian Spit. If the weather is nice, you can also boat or sail in the sea. But it is possible only when the waves are not so big. There is no life-saving station in Preila!