Clara said:Playa d'en Bossa isn't the best area in Ibiza for cuisine, but for good pre-club food, there's a nice pizzaria pretty much directly over the road from Space.
There's also a lovely Indian restaurant called Tandoori Nights but that might not be the best idea.
Or Passion, just down the road from Jet opp Space, perfect for pre-Space snacks, smoothies and rose