A few that come to mind: creative writing groups, acting groups, language learning groups and exchanges, book clubs. I'm sure there are plenty of others. Besides being generally intellectually rewarding activities, women are usually the majority in groups like these, and they are likely to be smart and interesting to boot. The emphasis is also taken off of small talk and social poise, and placed instead on intelligence, creativity, authenticity, and other traits that nerds excel in. Even if you don't meet the girl of your dreams, you can at least have a good time, develop your mind in some new directions, and expand your social circle a bit.