My boyfriend's birthday ๐Ÿ’ž

My boyfriend's turning 20 in April! ๐ŸŒˆ

I want to surprise him because I think it's a very special milestone but I don't know what to do exactly. I'm already taking him to a music festival but that's before his birthday. Any tips, suggestions? ๐ŸŒš They can be sexy ones or cute ones, it doesn't matter haha.