i am also pretty clueless about our famous club scene. i do know however that the vast majority of visitors to the island have a brilliant time without ever setting foot in a disco.
there are so many other things to do that don't cost a fortune. there are hundreds of bars which have live and canned music. places with other entertainment like comedians, hypnotists etc etc. i went to watch a supremes tribute band last night for absolutely free and the drinks were reasonably priced.
in figueretes you are walking distance from ibiza where there are tons of small cafes and restaurants where you can buy very good food at reasonable value - tip: if you see lots of local people eating there, don't be shy, just go steaming in.
and in figueretes you've got lidl, the cheapest and busiest supermarket in the world.
you'll enjoy your stay.