Do a bit of research
It’s fun to go out on a whim, but that’s not always possible when following a gluten-free diet.
Have a look at the restaurants websites before you go. Look for dedicated gluten-free menus and markers that items are or can be made gluten-free.
It’s also a good idea to call the restaurant before you go and talk to the manager or chef. This is your best way of getting your concerns answered clearly and directly and you will get a feel if the restaurant fully understands the importance of your diet.