Originally Posted by Blue6
If you have good walking shoes and aren't carrying a heavy load (cosplaying), the 1.3 mile walk should take about 25 minutes. The sidewalks in the area are pretty walkable. If you're weighed down a bit, it might be a little more work than you'd like, especially for a hot summer day. The weather is great at night though.
The Marriott and Hilton are so close you can probably travel between either hotel and the convention center within a minute if you moved with a purpose. You'll easily make it, unless you stop to take photos of cosplayers along the way or are stopped yourself. Trust us when we say it's close.
The walkway that runs between the Hilton and ACC is about 100 feet wide. The Marriott is a bit farther, because their parking structure separates the two, but yeah. If you aren't dragging your feet, you should leave the ACC and reach either hotel in under 60 seconds.
Bird's Eye View:
From street level:
Both of those were from Google Maps, there are tons more if you want to look them up yourselves.