I am not Jewish, but sort of try to emulate some parts of it to see if it does me any good. Well, not doing anything for 1 day is too boring. Actually what else can we do anyway during sabbath beside sleeping? The game is diablo 3. Basically we "work" on gaining level trading items, etc. But hey it's a game. It's not like I am programming. What would a Jew in my position do?
Unfortunately video games are out on Shabbos, as we are not permitted to manipulate electricity. "Working" on Shabbos is not defined by what we achieve, but rather what is defined in the Shulchan Aruch (Jewish Code of Law) as "work". (For example, the Talmud states that one can carry heavy loads around the house all day and not desecrate Shabbos, but carrying a small object to a different domain is forbidden.) An overview of the basic laws of Shabbos can be found here. Jews typically spend Shabbos in synagogue praying, spending time with the family and learning Torah.
the talmud says that Shabbat is given for the study of torah.if one does not learn torah, then indeed there is very little to do. furthermore, a nonjew is NOT allowed to keep shabbat by refraining from work. I think it's best to focus on doing your mitzvot properly, i.e. the 7 laws of bnei noach