Hi Judy, Contact the forestry commission in the area you are going to visit. Ask where there are some large old trees. I do not think I would mention you re going to climb them.
Tree climbing is still a new concept.
Also ask the chamber of commerce in the towns you are going to be near where their good trees are. You can find all of the above information mostly on the Internet. So happy hunting. Make sure you report back to this site on what you found on your travels. Inquiring climbers want to know.