Suva is the capital of Fiji and is on east coast of the main island. It's a 3-4 hour bus ride or 2-3 hour car ride depending on how you want to get there. Suva is the more built up city in Fiji with a few museums etc.
Momi Bay is a more secluded beach area about an hour from Nadi. Great hotels like the Marriott Momi Bay which has rooms sitting on the water.
We're not the best water people, in fact we've both almost drowned a handful of times. There is a story about how I almost let Tanya drown in Thailand, but that's all lies. Apparently Rainbow Reef has some of the best diving in the world. Getting there is a bit of a mission but well worth it by the pictures.
To help with the post wedding blues or hangover or hangover blues.