Choose a Sefer - Jewish themed - any language, and try your hardest to include clues about your identity in your selection. Inscriptions are great! Extra points for pretty packaging :). If you can deliver in person, that would be awesome, but of course, there’s always the trustworthy mail service. Stay within budget and when you get your Sefer feel free to post on social media with the hashtag #secretsefer Happy Hanukkah!