Will be at the Fountainbleu!
but will also be able to get out to eat ---would wwelcome suggestions on places nearby - preferably walkable - and ethnic ----
Not a lot to walk to near the hotel, but the shuttle bus or a taxi to Lincoln Road area brings you to most popular spots for "ethnic" chow like David's Cuban, Sushi Siam, Indomania, Chalan, O Asian Grill, Le Bon Belgian, etc. 41st Street area is largely kosher (like kosher Chinese "Mr Chopsticks" and a few casual cafes).
Search this board for recent South Beach threads. For a nice dinner, go to 23rd Street Talula, check out the roof of the new Ganesvoort...
I can't think of much right on Collins there, which is "Condo Gulch". A walk to the 41st Street (a/k/a Arthur Godfrey Road) area is probably about a half mile from the Fontainebleu. AG is right that the predominant "ethnic" in this area is Kosher. Pita Hut has pretty decent middle-eastern standards - shwarma, falafel, hummus, baba ganoush, etc. wrapped in a laffa bread. Arnie & Richie's Deli apparently is underoing a conversion to a "Roasters and Toasters" and I've not been recently, though it was always just sort of average Jewish deli.
If you can get yourself to South Beach there are lots of threads discussing options, including this recent one on Miami Beach ethnic ->
On the other hand, iIf you want to head north rather than south, I've done a google map of many options around the 71st Street Normandy Island area and westward back toward the mainland ->
Hakkasan is one of my all time favorites. I hope they are not going the way of many of the so called star chefs: licensing their name. We dined recently and Wolfgang Puck in Vail, CO because we arrived late and it was the only option at the Ritz.. Almost not edible. Many of these licensed establishments are chain restaurants with seemingly no link to the original chef.
I have heard two positive reviews on Scarpetta which have recently opened at the Fountianbleu, however, I have not made it there yet personally. Firends loved the food and atmosphere. Scott Conant from NYC is the chef onboard.... I have eaten in the NY location and liked it a lot.