We celebrate both Hanakkah and Christmas and have spent some of the last two Hannakkah's at WDW. I brought a small Menorah - very pretty and uses birthday candles. Also window clings for both Christmas and Hanakkah for the patio door. One of the Hanakkah clings is a Menorah and you add a cling candle every day -the girls love that one.
As far as tradition we lit the candles and did the prayer each evening and I brought along a small gift for each day of Hanakkah we were there. We brought along a dreidle and some gelt - and I also used some disney dollars LOL. We found some cool "disney coins" at the candy shop in the CR that we also used as "gelt" as well.
The American Adventure pavilion at Epcot has a Hanakkah presentation as part of the Holidays Around The World. Very short but nice and they give out a dreidle and gelt to the kids. We really didn't find much in the way of a traditional meal but maybe some jelly donughts or french fries? JK - thinking of the oil.
I wished I had done more checking myself so perhaps a call to guest relations, disney dining or even a check at the resort will give you more information. Have a wonderful time.
TJ