Departing for FIJI in just 3 Days - What shouldn't i miss????

I fly into Nadi in Sunday at 5am for one week with my boyfriend. This is a surprise trip so pre-planning did not happen. Homebase in Nadi however quite excited about going someone for a night or two. Please share with me things I CANNOT Miss on this adventure. As well as ideal locations to take off for an overnight experience.

Fiji is a great place just to relax.
I don't regard it as a place that has things that you CANNOT miss.
Because of travel times it is probably easier just to go out to an island in the Mamanuca's if you want an overnight experience, actually it is better to spend the most time on an island and just do Nadi as the overnight bit.

There's a great place for dinner on the road from the airport to downtown-it's called Ashyana.

Wonderful food delightful staff a real treat be sure not to miss the experience.

make some quick internet plans to get to an island asap am when you arrive from Nadi which is not really liked by travellers