Enjoy without worries
Lemmer offers free parking. However, you should pay close attention to the blue zone; if parking spaces are marked with a blue line, it is required to use a parking disc. Adjust it to the arrival time, after which you can park for free for two hours. Avoid a high fine; the use of this disc and parallel parking are regularly being checked.  
At car park P4 and the parking area at the beach, you can park for free, without having to use the parking disc.