Restaurants in Cancun are ready for anything. They cater to visitors of all ages from all over the world every single day. So if you need a highchair, just ask, if you're celebrating a birthday, just let them know, if you're allegric to shellfish, be sure to inform the chef, and if you're visiting Cancun with a big group, don't worry, because in Cancun's dining establishments, the more the merrier rule applies!
That being said, it is a good idea to make reservations for large groups so that a restaurant can have your table ready and waiting. On the other hand, if you just happen to come across a place that looks interesting, most Cancun restaurants will be more than happy to quickly prepare a table for your group.
There are both casual, inexpensive restaurants and more pricey, formal restaurants in Cancun that are well-suited for large groups. In the Hotel Zone diners will enjoyLa Habichuela Sunset (upscale Mexican, Mayan, Caribbean and International), Mextreme (Mexican), La Destileria (upscale Mexican), El Fish Fritanga (seafood), Thai Lounge (upscale Asian) and Harry's Prime Steakhouse and Raw Bar (upscale steak and seafood). Downtown Cancun is home to Julia Mia (gourmet Mexican), La Parilla (Mexican) and Labna (upscale Yucatecan).