"Who enjoys bingo, war, uno, obsessive uno, DJs, and jedi-ing puzzles of risks? Alvin! Going jedi pleases, and so jump on your not-actual gift (if you can open it). Best, PBJ."
Sorry for the ridiculousness, but it seriously took me forever to come up with something into which I could embed the cipher. I also checked my journal for what I thought of Alvin back in the day. Here's what I had to say:
"Alvin is quiet, humble, intelligent, active spiritual and a great example...He's a really great guy and I've learned a lot about stretching my limits and magnifying my calling from his challenges to do push-ups, read scriptures, sing hymns, etc. He's a wonderful roommate."
Happy birthday, Alvin. Hopefully you crack the code before the present itself arrives.

P.S.- Here are a few cipher parameters that will simplify the decoding process: I/IV/I.