Experiences hosting duration

[Foong0]

Hey everyone, Jeff here from Malaysia. Currently I'm having two experiences hosting which is food tour and local attractions tour. The things that happen to me sometimes is the guest would request for another place to visit which is not stated in my description and leading to a longer duration time of trip. I'm confused whether should I charges them for the extra things I do for them? 

One of the best example will be my food tour will be starting at 7:30pm and end in 2.5 hours time. And then some of them will requesting me to go for beer place after the food ending up my tour will end at around 12:00am. 

How do you guys think what shall I have to do? I hope someone can advice me on this. Thanks!!

[Kath9]

@Foong0I think you need to be firm with your boundaries. People will try to squeeze as much out of you as possible, so just say, 'sorry, that is not included in the tour but I'll happily direct you to the nearest beer place!'.