Can a group of four 16 year olds go on holiday to Spain?

Asked: Can a group of four 16 year olds go on holiday to Spain?

Me and three friends want to go to Barcelona when we are 16 after our GCSE's because we are all expecting to get good grades and hopefully our parents permission. We want to get a plane to Barcelona, and explore the city. Then the next day we want to go to Port Aventura and then go there again the next day to have more fun and maybe see the water park. Would any hotels let a group of 16 year olds stay there. Keep in mind we aren't the average getting drunk, staying out all night, trying drugs teenagers. We just wanna see the city and go to Port Aventura