I mean, the holidays are coming up. Idk how much Alberto knows about them but Luffy knows NOTHING. He thought Halloween was strange and awesome, now he'll be learning about other new holidays. They could maybe learn about them together? Or Alberto could show off his amazing knowledge and teach Luffy something? Either way, potential for light and harmless fun.

Also, they could totally do Pagemaster for a side quest but only if you're ready for MASSIVE FAILURE lol. I can't imagine either of them know much about filing books.