Do not complain about the food when eating at a vegan / vegetarian restaurant. When in doubt, just order a smoothie.
Do make an effort to eat more vegetarian food when socializing with your date.
Do not start arguments by pointing out your date is wearing leather boots.
Do realize you will likely end up living in the Vegan Village in Toronto or some place similar if the two of you buy a house together.
Don't mock their food choices. Being a vegan or vegetarian is often an ethical decision for people and is practically their religion.
Do have picnics whenever the weather is good for it. Picnics can be a surprisingly frugal way of "dining out" together.
Don't make a big deal about things that are obviously an issue for them. Just stop worrying about it and be "easy going", "down to earth" and whatever other things you claimed to be in your personals profile.
Do avoid talking about food too much. Basically don't talk about it unless they bring up the topic.
Don't take them to a normal restaurant on a first date. Try to accommodate and show some interest in their food choices.
Do try to fall in love with them, not some idealized version of them.
