Australia, New Zealand & the South Pacific - Majuro, Marshall Islands

I'm considering burning up 240k OnePass miles on a reward reservation for myself and my girlfriend this winter. Has anyone here been to Majuro or other atolls in the Marshall Islands? Any advice? We're pretty adventurous folks and would be happy to find a little slice of paradise in the middle of the Pacific Ocean. We were thinking of spending about 10 days in the area. Is it easy to get around from atoll to atoll? Is 10 days too much? Again, any insights or advice is greatly appreciated.

Thanks in advance!