The typical bookend to the Pacific Island Forum in Solomon Islands will be held in Munda, an idyllic tropical location more than an hour-long flight from Honiara.
Leaders were locked in talks for all of Wednesday, with Prime Minister Anthony Albanese a late arrival to the summit after a stop in Vanuatu.
The side trip proved a fizzer for the Nakamal agreement security deal, which is yet to be finalised, although Australia did progress talks with Fiji to "upgrade" the relationship and begin negotiations on a new bilateral security treaty.
The official ratification of the Pacific Resilience Facility treaty was a hard-fought win for advocates who have spent 10 years trying to get the regional climate fund off the ground.
Australia has already funnelled $100 million into the fund, which was set up to make it easier for Pacific communities vulnerable to sea level rise, cyclones and other climate impacts to access small sums of money for adaptation programs.
Leaders also threw their support behind the Australia-Pacific attempt to co-host global climate talks, keeping pressure on a competing bid from Turkey.
Mr Albanese said he and his counterparts were determined to bring the 2026 Conference of the Parties (COP31) summit to the climate-vulnerable region.
"Countries like Tuvalu and Kiribati, their very existence is threatened by climate change," he said.
"And it's appropriate, given particularly the context of where the last few COPs have been held, that it be held in our region."
The case for a 100 per cent renewables-powered Pacific was also posited at a side event featuring Vanuatu's Climate Change Adaptation Minister Ralph Regenvanu and Tuvalu Prime Minister Feleti Teo, and first instigated by Palau President Surangel Whipps Jr.
Pacific leaders also endorsed the Ocean of Peace, a Fiji-led declaration that reaffirms regional solidarity for peace and security.
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