Will my ROKU work On other TVs outside my home?
Yes, your Roku Express+ should be usable if there is a good 2.4 GHz wifi system there that will allow you to connect to it. (Express+ connects only with 2.4 GHz band, not the 5 GHz band.)
If you are at a hotel or resort where you have to activate your internet access by logging into a web browser page, see this Roku page which explains the process: https://support.roku.com/article/215058118
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And don't forget the remote and power adapter. Without a physical remote you won't be able to get it connected to Wi-Fi.