Of course, theoretical physics is not the only interest in my life. However, most of my hobbies are also related to physics. Although this is a good description, you could also visit my personal webpage (in spanish), where you can find, for example, my gallery of astrophotographs, lots of links,...
In spite of following a PhD in theoretical physics, I am an amateur astronomer. I started this expensive hobby at the Asociación de Astrónomos AFicionados (ASAAF), a student association at the UCM. The thing is that, nowadays, I have two telescopes, a computerized mount and several cheaper astronomical articles (the DSLR camera is not taken into account). I love both visual observation and astrophotography, and have taken a small collection of astrophotographs with my own equipment. However, I think the most interesting activity, in this field, is showing the sky to other interested people.
Although this is actually part of my job, I have always been interested in informatics. Specially, in things like programming, managing Linux systems, informatic security (including the legal usage of things like BackTrack, WifiSlax and Metasploit),... Besides the usage of computing clusters, I administrate the group's webpage, and have helped with the administration of the ASAAF's server. It is remarkable that, with a small assistance, I managed to recover the damaged databases of Astrowiki and Wiki de ASAAF (MediaWiki suported sites). During a year, it was though that the only way of recovering those sites was handly, page by page. Several people were being asked for this repetitive task.
Furthermore, I have also been interested in electronics. Specially, in building MW radio receivers and transmitters, and in microcontrollers (PIC16F84 and PIC16F73). Indeed, I have just obtained a 'ham radio' license which I hope to fully use as soon as possible. I even went to Campus Party, to the robotics section. And afford for my own electronics laboratory, including an oscilloscope. The best moment is when you manage to get your circuit running. Specially, taken into account how fragile look those circuits, mounted over protoboard modules. I had to learn by myself, reading books on the public library and visiting webpages like http://www.pablin.com.ar .
Lastly, I also got interested into chemical photography. I learned to develop by myself black & white films at the Asociación Fotográfica de Guadalajara (AFGU), and have used both 35mm and 6x4.5cm reflex cameras. Of course, nowadays I have several albums of films (of both formats), slices and black & white photographs. I specially like the apparency color photographs (both chemical slices and digital) taken at night, with a tripod.