Matava is great for diving and possibly for fishing (although we didn't try it), but anyone else might be disappointed by the lack of other activities - or not. The beach is non-existent at high tide and would be better described as mud-flats at low tide. Kayaks are available free for guests, and it is possible to walk to the local village and rather spectacular waterfall, although after rain the path becomes barely passable. It’s better to kayak to the village or persuade the resort staff to take you there in a boat, in return for fuel money of course.
The diving on the Great Astrolabe Reef is fantastic, although some of the boat trips out to the sites can be challenging in rougher weather. We saw mantas, sharks (small ones), schools of barracuda and lots of smaller fish as well as coral in pristine condition. Some days we reckoned that our group of three or four were the only people diving on the whole reef. Trips to the manta ray site are run twice a week weather permitting, and the local guides reckon that mantas are seen 7 times out of 10.
The resort styles itself as an eco-resort, which in practical terms means that waste is recycled, some of the food is organic and electricity is solar-generated. There are no power sockets in the bures, so don't bother taking a hairdryer! Batteries for cameras etc. can be recharged in the office. Meals are excellent, although the fruit and veggies can be a bit repetitive as since they serve whatever is in season. There are only so many ways to cook cabbage!
The transfer from Vunisea is in a small open boat, and can be bumpy and wet in inclement weather. Like banging your head against a wall, it's nice when you stop. Apparently this southern side of the island often has the best weather in summer, when the rest of the country is hot and humid, but gets the trade winds in winter, which makes for rougher seas for winter diving. Whenever you go, a sense of adventure is definitely needed!