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There was apparently a Dutch-Belgian show that from what I read matches your description, though since I've never seen it I can't be sure, called Galaxy Park. It took place in a bungalow park the name of which I'm sure you can guess, and while the (Dutch) wikipedia page doesn't mention blue lights the teens, summer and the fact that one of the boys was an alien are all there.
Edited by dutchguy1986
Sorry for my english i hope it's not too bad so you can uderstand me . So i remember a tv show where a few teenagers were in a park . I think it was summer. The theme of the park were aliens and every one had a little house kind of. The father of one of the girls was working in the park. Later on the show that girl find out that one of the boys is an alien. The aliens were big blue like lights or something.The girl and the boy started liking each other and i think they bocome a couple. There was one person that was working on the park and was searching for the alien (he was an alien too but one of the bad ones). I can't remember much but i hope someone knows the name of the serial.