I have been a vegetarian and have lived in SoWal most of my life. If you PM me I can tell you where NOT to eat; some restaurants around here offer nothing for us...

I will give you a list.
Here are your best options for a healthy, hearty meal in SoWal.
For the Health of It in Blue Mountain Beach has the best groceries. Everything you need to cook a gourmet Vegan meal, or just pop one in the oven/microwave. They use to have a vegetarian restaurant...all organic...God I miss those days!
Hibiscus is great for breakfast, The waffle without honey rocks my socks.
Angelina's in Seagrove will do Pasta/Marinara (ask them to hold the cheese). Yummy bread sticks and salad too.
Fire, has a Tri Dip offered with endive, chips and pita bread. They have vegan dips such as Spicy roasted red peppers with cilantro and peanuts, Hummus and Olive Spread. This is the best food I have eaten in along time!
Gravel Road in Grayton Beach will do anything you ask. They are very accommodating to Vegans.
Cantina Laredo, La Paz, and Don Pedro's all are Mexican restaurants that do not use lard in their beans.
Tropical Smoothie (in Destin) has a yummy Veggie, Veggie wrap (ask them to hold the cheese)
Bud and Alley's in Seaside can do a veggie plate, haven't been there in ages but ask for Dave and plead your case.
Rolly Polly in Seaside had 6 veggie sandwiches/wraps. The California Hummer is the best! ;-)
Sushi Siam in Destin Commons has many vegan options they offer Thia food and sushi. The red curry is yummmmmmy. Get it spicy, but have them put the spice on the side. mmmmm.

I think that may be it, if I remember more I will let you know.