Hi all. We are going to do a European cruise in June, 2013 and we're taking the kids and their wife and girlfriend-- 6 of us in all. I have some United miles and a lot of Marriott points I'm going to convert. We won't need the hotel stays so the travel package doesn't really apply.

I'm planning on converting about 375,000 Marriott points into miles. A couple of questions-- I note that the highest conversion is 125,000 points into 50,000 miles. Are there higher points that have a better conversion rate? Has there been a historical time that there have been bonus miles on conversion? Thanks for any help anyone can provide.