Any ideas on what to do before he`s gone?

oki doki, so my bf is going abroad on work for 2 whole months, and before he leaves i want to do something simple but sweet. i was going to leave him a letter in his suitcase, what more can i do?? any small romantic ideas? on the letter i was going to tell him how much i love him, and how much i will miss him. all ideas are appreicated!! :) thanks to all