When I installed Claro fiber I was responsible for digging the trench and providing the conduit for Claro to run the new line from their drop on the street to my house. Others in my neighborhood had to do the same and in some cases that meant digging up a part of the roadway to get the line across the street then repaving.
I don't know anything about the utility conduits in SD. I don't think Claro would be able to fish a line from an adjacent street but maybe in SD there are above ground options. Generally speaking if Fiber service is not available at the drop being used currently, then getting it to that utility drop is Claro's problem and all the people on the street need to start clamoring for Fiber connections as it is available locally, just not local enough.
In any case, the quality of the signal at the modem connection inside a structure is completely dependent on the quality of the signal being delivered to the structure by Claro and Claro's equipment. Fiber can provide a cleaner signal and faster speeds than twisted pair or coax. If Claro's half of the equation is crappy, the customers experience will be crappy.
If this hotel makes use of wifi to deliver internet service to the guests, even with good Fiber, the wifi service can still be lacking depending on how the in-hotel wifi is setup, the equipment being used and how many repeaters or boosters are employed. If the hotel supplies plug in connections, then little if any internal rewiring should be needed assuming those cables are intact and not munched by ants, roaches or have nails pounded through them.
If the current internet service is good in the same room as the current Claro modem but not good in Room 23C then the problem is probably not with Claro but the hotel's internet distribution system itself. Claro will bring the connection to your home or business but how you get that signal to every room or every part of your house is up to you.