ok sarasmile... here's my humble opinion and please don't take it the wrong way.
First of all I would remind the Lakota of his Sioux roots. Remind him where his forefathers such as: Chief Rain In The Face, a Hunkpapa Lakota and Sitting Bull, leader of the Hunkpapa and how they spent their honeymoons and where they lived.
You said he finds it offensive? Belize and the jungles are totally different and in some respects MUCH better than where he lives now.
Since he has diabetes and a bum foot, have you asked him where he
would like to go?
I know this sounds curt and unsympathetic, but it's not meant that way at all. I hope you understand and take it in the way it was meant. But no matter where you go... have a GREAT honeymoon and marriage!!