You could take a two-class plane to Denver, which would bring those First Class awards down to 2 x 60k miles.

The intra-Hawaii flights are cheap in miles; it probably isn't worthwhile to pay cash for them. But that might be another good way to save miles.

Ninety thousand miles apiece could get you to New Zealand or Australia, as well as points in Asia, or 80,000 miles to Europe. How about a Roman anniversary? However, we honeymooned in Hawaii too. If it were me, I'd choose Hawaii.