If you're not sure if it's an appointment beforehand or not, don't worry. Wait for it to happen and you'll see when it happens. Often, when you arrive, you realize it pretty quickly. If it seems like they've put a little thought and effort into creating a special environment, it's most likely a date.
Although I'm more than happy to go on dates at the cheap bar down the street, normally if the person doesn't know you, they'll try to improve the game a little bit for a date. Was a gift given? Bringing a gift to your partner (flowers are the most traditional example) could be a clear indicator that you might have had a date. This also includes if something was bought during the tour and was given as a gift. For example, you win a stuffed animal at a carnival, or maybe chocolates or wine in a store.
If your date brought you something special, it could have been a sign of their interest in you.
