Hi Maimoona:
It would ideal to be able to plan two (or more) field trips in a given class. Many courses are shorter, so there just isn't enough time for even one field trip. In general, there are great benefits to field trips and guided tours, and I think instructors should try to schedule them whenever they can, preferably around the same time as that topic is being discussed in class. It's great when it works out that way.
Regards, Barry
