Camp Silos - Reasons for going on field trip, and detailed planning guide.
Majestic World - Virtual Field Trip with a couple that took photos of their travels.
Walter Mckenzie Innovative Teaching - Link site to lots of virtual field trip resources. Some look ancient but others are pretty up-to-date.
Nature Net - Tips on doing Nature field trips.
The Teacher’s Guide - Links to a number of virtual tours and field trips.
University of Florida IFAS Extention - Tips for how to integrate fieldtrip with your lessons.