Is it easy to walk from the Trump Marina to the Borgata and Harrah's in Atlantic City?
I am looking at staying at the Trump Marina hotel and want to hit the Borgata and Harrah’s while I’m there. Is it easy to walk from the Trump to those other 2? The maps I have looked at make it look like the only road is Highway 87, and I don’t consider that an easy way to walk. Or perhaps is there a shuttle that can take us to the the 3 properties? Anyone who has stayed there, your input would be appreciated!

There isn’t a shuttle between the properties. They’re owned by different companies, so there would be no point in having shuttles.
Supposedly there is a walkway between the 3 properties, but I personally haven’t done it: http://www.tripadvisor.com/ShowTopic-g29750-i78-k2907596-Borgata_questions-Atlantic_City_New_Jersey.html
If you pay for parking at Trump Marina, you can bring the receipt with you to one other casino and receive free parking at that casino. The receipt has to have been issued within the past 24 hours, I believe.
No you take a cab.