I’m not sure if you’re talking about riding around Hel or riding from Hel to the mainland. If you prefer to just ride around or are traveling long distances, definitely set up a board with large (58mm-70mm) soft (78a) wheels which will roll over rough surfaces easier and keep their momentum so you won’t have to push quite as much. If you just want to learn how to do tricks and are not traveling long distances, you can ride almost anything. Your best bet is to look through the Setups and Cruiser threads here, especially, where people post what they are riding and often include some extra information on why they like or chose that specific setup. It’ll probably take some time to get your mind around all the crazy reasons people ride what they ride but eventually you’ll get used to it and when you get to spend some time riding different things, it’ll all make more sense.
Good luck