Share car rental around Fiji

I have booked a Budget rental car for a week (Saturday 18 to Saturday 25 May 2013) to explore Viti Levu. I'd like to visit less touristy ( more Fijian) villages, and still snorkel dive in a couple of places. It would be great if one or two people would like to add to the adventure and share rental costs (250 euros in total) + petrol.