Chromecast and other similar streaming devices are great and portable, but if you can't get access to the hotel's network it's completely useless when you're travelling. The How-To Geek explains a few ways to get your device working on hotel Wi-Fi.
The site shares a few approaches. We particularly liked their first solution: a good travel router.
Your Chromecast probably has trouble connecting to the hotel's Wi-Fi because of the splash page where you sign in. Obviously, the Chromecast can't get past that screen without a browser. But a good travel router can help you bypass it:
In an age when everyone is connecting wireless and the bulk of a hotel's security efforts are focused on the wireless network, Ethernet jacks represent a sort of portal to Narnia where the data flows free and fast. In our experience the Ethernet jacks in hotel rooms are very rarely secured in any fashion and you can simply plug in a device and go... Although i'ts rare, if the hotel does have a login/authentication splash page for Ethernet users you can simply visit it with one of your devices (while connected to the wi-fi router). The router has a single IP/MAC address and doles out access (just like your home router) to all the attached devices. Once you accept the terms of agreement with one device through the unified access point the security system will let anything connected to the portable Wi-Fi router, including the Chromecast, pass through just fine.
Of course, your hotel room will need an ethernet jack for this to work, and it's a good idea to have a device with a browser that can connect to your router as well. If you're worried about how things will work, you can set up the whole system ahead of time so it's simple as plugging the router in when you get there. For their other tricks on getting around hotel streaming blocks, check out the link below.
How Can I Use My Google Chromecast In a Hotel Room [The How-To Geek]