The next person to the one who has scored a shot should also score from the same spot. If he doesn't, the person who didn't score gets labeled D, and if he misses again in the next round, then O. The game ends when someone completes the letters for PIG. It's fun to play just shooting hoops on a basketball court with a little competition.
Decide which one suits both of your interests, like choosing the nerd-comedy Big-Bang Theory, or a science-fiction series like Star Trek. Geeks mostly have a backup of their favorites TV shows.
Join two computers (a laptop to a desktop or two laptops) using a LAN cable (don't worry, the geek will have this covered) and play a one-on-one session of Mortal Kombat or set a race in any version of the Need for Speed series. Or you can even have fun on a PlayStation or Xbox. As long as the two of you are having fun, the gaming-device accounts for little.
Having the latest tech gadget or keeping themselves updated with the latest know-how of the tech world gives them a high, which only they can relate to. Book fairs give them a chance to add books of their interest to their personal library.
Plan a Scavenger Hunt
Leave a trace of clues around your house or neighborhood and place a fancy present at each location. These will be the reward for unraveling the clues, for your partner.