We're planning a celebratory meal for my (soon to be) 29-year-old sister. It will be four of us (boyfriend, Mom, sister, birthday girl) and we'd like someplace lively and fun with great food that isn't too fussy (and that takes reservations!). Any advice on places in Boston/Cambridge area would be much appreciated. We're adventurous eaters and would be happy to try something off the beaten path if the food merits it. Fancy less important than fun!