Help! Where to go for 6 days of diving and relaxing?

Hey everyone!
Thank you for reading my post!

Me and my boyfriend are planning on doing a trip to both Tonga and Fiji in August and need some advice!

From August 6 to August 16 we will be in Tonga mainly to swim with the humpback whales and also do some relaxing at the beach in Ha'apai. Hopefully we will have the opportunity to do some diving too since we are both AOW divers with around 50 dives.

After that we arrive in Suva at 17.15 on August the 16th and will be leaving from Nadi on the 24th at 08.20 o'clock.
We would like to spend these days at a relaxed place with a nice beach and good diving. Where should we go??? Would really appreciate some advice on where to dive and where to stay? (Might be able to rebook the return ticket to Nadi if that could help your creativity).

Since we have already stretched our budget we can't afford to take anymore flights but other than that we are open to suggestions! :)

Thanks, Sophie

Sophie, Check into Volivoli.com The dive resort is off the northwest shore of Viti Levu. There's also good diving at
Beqa off the south shore. Either place involves a multi-hour bus ride from Lautoka (to Volivoli) or Nadi . Cheers!