What are some cute ideas to surprise my boyfriend for our 6 month?

sometimes on the month me and my boyfriend will surprise each other. we kinda have like a war going of who can come up with a better surprise. for example one time i went over when he want there and decorataed his room. so for 6 months apparently he is planning something reallyyyy good so i need to come up with something better but i need some ideas? i would reallyyyy appreciate the help and please keep in mind that im only 17 so it cant be anything toooo extravagant. thanks so much!