Disclaimer: I am not full-blown celiac but I do have a gluten sensitivity - so I can probably stomach some things that you may not be able to.
Restaurant food is hit or miss. It's easy to avoid the things that obviously have gluten, but sometimes it can be hidden. I typically stick with a salad with a simple oil and vinegar dressing. If they only have prepackaged dressings - which often contain hidden forms of gluten - I'm not above just liberally applying salt and pepper to a salad. Fruit is always good for a gluten-free energy boost. In the diet-crazed US, quite a few places these days have a "low carb" menu which is often gluten-free as a side effect. Many places offer low carb burgers which is just a burger wrapped in a large lettuce leaf instead of a bun.
On the road, you'll probably have to go with food of your own making (I prefer it anyway). There are some decent recipes around the net for gluten-free trail mixes. My personal favorite mix usually contains some or all of the following: walnuts, almonds, sunflower seeds, chocolate chips (dark), dried coconut, raisins/craisins, some other dried fruit usually apples or apricots. I've put dried banana chips in as well. I'm currently experimenting with using honey as a binding agent to try and form the mix into bars for easier portability. I may try some oatmeal in the mix as well to see how that goes. Bob's Red Mill is a company who has a lot of oatmeal and other grain type products that are 100% gluten free.
