As travelers, this is we love to see!
iTaiwan is a free WiFi service rolled out by the Taiwan Tourism Board for foreign visitors with more than 5,000 hotspot locations throughout the island. The WiFi hotspots are available in the indoor public area of local tourism attractions, transportation nodes, cultural and educational facilities, and government offices. Visitors can register online at http://itaiwan.taiwan.net.tw before departure or register after arrival at a tourist service centre located at any major airports, train stations or mass rapid transit (MRT) stations in Taiwan (require passport). You can register for individual or in group. Accounts are effective for 30 days and can be extended to 60 or 90 days as needed.
This is a user-friendly site which will provide you sufficient information for registration.
For more information, you can visit the respective links.