The Hyatt and the Rosen are the two most accessible hotels to the convention center. I have stayed in both of these hotels and I prefer the Hyatt has just slightly better amenities
There is a walkway that goes directly to the Conference center but I suggest walk across it's less than a minute and you are at the main entrance then you can go North/South your choice.
Our event just found out we were in the North/ South building and I wanted to make sure the Hyatt was connected to that one too.
There's walkways to and from the convention center. It is very convenient.
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