I've been on The Arenui in both Raja & Komodo. I've also done a liveaboard & land-based option in the Maldives (Carpe Diem & Kuramathi) and Fiji Tavenui. The best diving was hands down on Arenui. There is not a better liveaboard out there, which is why they book years in advance; however they do get openings. Get on their email list to find out about them. I agree with other posters that the romance part of the trip is going to be better on land for privacy reasons if nothing else. The Maldives & Fiji are better for that aspect as is Atmosphere in the Philippines. I haven't been to Palau but was recently reading out how that area is heating up with military maneuvers in the ongoing Chinese expansion issues. It was enough to make me concerned about impacts on sea & reef.