Have you checked out the InternationalTravel Planner at https://www.verizonwireless.com/support/trip-planner-tool/ ? It can tell you the best options based on your plan when travelling.
Actually, almost all Verizon Wireless Postpaid Plans include usage of minutes, messages, and data in domestic roaming areas as though you were connected to the Verizon Wireless network. If you have a grandfathered plan, though, you will want to check your plan details to see whether domestic roaming fees will be assessed or not. However, since you are on the Go Unlimited Plan, domestic roaming is at no additional cost to you. You do need to keep in mind that since you are on a mix-and-match unlimited plan, your domestic data roaming speeds will be capped at 2G speeds. Therefore, if you want to stream music or videos, you are going to want to be connected to Wi-Fi. I hope this information helps you.