The upper-end SOHO (small office/home office) routers have speed limits you can set.
Not usually found in consumer routers.
You'll probably need a consultant to set it up for you, or a very geeky friend/relative.
If your hotel/motel is small, and does not have an elaborate IT system, then one of the SOHO routers with speed/bandwidth constraints, also in the category of quality of service (QoS). Some possible vendors:
ZyXel
Juniper
Cisco (not Linksys)
and others.
Best to get a (main) wired-only router, and if you use WiFi, put that on a separate access point (AP) that connects to the main router. There are APs distributed as needed for WiFi coverage.