The hotel level of service classification can be broken up into categories and budget.

A central reservation system, also called an airline or computer reservation system, serves as storage for flight-related information like schedules, fares and rules for each booking class, passenger name records (PNRs), e-tickets, etc. It's also involved in managing booking requests and ticket issuing.

An online booking system is a software solution and reservation system that makes it simple for guests to book and pay for your tours and activities online.

Without stress, you will have fun walking through monumental places. There will be time to take pictures, it will be a fun experience, this is for everyone (families and retired people included).