Somewhere between the Yasawa and Mamanuca islands, a school boat full of Fijian kids runs aground on a sandbar racing the tide. Passengers and crew from a nearby ship wade in to help push it free, everyone cheers, and the kids yell 'vinaka' as they motor off. That kind of unscripted moment is exactly what big cruise ships sailing to Fiji can't deliver — and it's the argument for going small.

Here's the problem: while Fiji keeps setting records for Australian visitors and cruising remains hugely popular, the big ships are simply too large to enter the shallow coves and reefs that make this corner of the South Pacific special. Fiji is a quick flight from Australia's east coast but a long haul by sea, so few mega-liners even make the trip. Enter Blue Lagoon Cruises, which has owned the Fijian small-ship market for the better part of 75 years, aside from private vessels and superyachts.

The writer joined the newly launched Yasawa Princess II, a 46-metre catamaran with just 22 cabins for 44 passengers. Its shallow draft is the whole point — it slips into sheltered bays and reef fringes that deep-keeled ships can't touch. Cabins run 14.5 square metres with Fijian art, a traditional sulu, local chocolate and an amenities kit stocked with sunscreen and insect repellent instead of the usual sewing kit. Up top there's a sundeck, a moonlight cinema and alfresco dining, with three, four and seven-night itineraries from Port Denarau near Nadi.

Trip highlights include snorkelling pastel coral gardens among stingrays and neon fish, and the Sawa-i-Lau Caves — limestone grottos where you take a breath, duck-dive through an underwater passage and surface into a turquoise-lit cavern with honeycomb-smooth walls. There's also a beach day at Nanuya Island where the ship ties to a tree and guests swim ashore to hammocks, massages and a stocked beach bar.

A note on the fleet: the company's other ship, MV Fiji Princess, ran aground near Monuriki Island in March and couldn't be refloated — everyone was evacuated safely and it has since been retired, making the new Yasawa Princess II the flagship. Captain Joe sailed it from Brisbane to Nadi with an all-Fijian crew this year.

Food runs from buffet lunches to barbecues and a traditional lovo night — pork, fish and root vegetables wrapped and slow-smoked over hot rocks, which the cruise director cheerfully calls 'Fijian McDonald's'. After the lovo comes a village meke dance performance, theatrical and playful, and then the part that lingers: an informal kava session around the tanoa bowl with off-duty crew and villagers, ukulele going, conversation flowing.

That's the real pitch. Big-ship cruising gets you a port call; a 44-passenger ship gets you pulled into village life. If Fiji is on your list and you'd rather meet the people who live there than queue at a buffet with 3,000 others, this is the version to book.

Costs to know: Fiji Airways flies from Australia's east coast from $765 return, and Blue Lagoon's cruises start from $2309 a person twin-share, including meals, activities and coach transfers.