Best Restaurants in Williamsburg
Not knowing your or or your guests' preferences beyond an assumed West-Coast sensibility, I'll just throw out the standard-bearers:
Dressler for upscale (Michelin-starred) atmosphere, clean, creative, nouveau-American flavors, and polished presentation.
Marlow & Sons for responsibly-sourced seasonal offerings in a cozy, exuberant (i.e. loud) setting. The menu changes daily and can be somewhat limited, but there are always several appetizers, salads, sandwiches, cheese plates, oysters, and inspired entrees to choose from.
Peter Luger would be a must for any uninitiated beef-worshiper (obviously).
Aurora for the neigborhood's best take on modern Italian fare.
Egg for all things rich, fried, Southern, and delicious.
The first 3 places lean towards the upscale end of the neighborhood spectrum - if price or cuisine are limiting factors, please post further specifications, or see the lengthy discussion here:
Marlow & Sons
81 Broadway, Brooklyn, NY 11211
149 Broadway, Brooklyn, NY 11211
135A N 5th St, Brooklyn, NY 11211
Peter Luger Steak House
178 Broadway, Brooklyn, NY 11211