Gift Ideas for Boyfriend's 18th Birthday?

My boyfriend and I have been dating for 4years and in a few months he's turning 18. I want to give him 18 awesome presents. There are no issues with my budget. We both are of same age and on my birthday he gifted me a brand new Apple iPhone. So I also want something huge and amazing for him.

He's quite different and likes new new things. His taste is very different from mine and I really don't know what to do because I'm scared whether he'll like my presents or not? Please help.