If you're meeting up with friends, bring your green juice "dinner." Not only will it give you a chance to talk about your juice-cleanse (see above), it will remind others that they are not as good as you. Lead by example!
I've juiced everything that grows and everything seems to go with everything else. Fruits go with vegetables and vegetables go with other vegetables. Herbs fit right in as do fresh ginger, garlic, and onions.