The Jaipur Jantar mantar is very well maintained and clean. Kudos to Maharaja Sawai Jai Singh 2 who in tumultuous times took out time for science and built 5 such Jantar Mantars. The thought, science and accuracy behind each instrument is awe inspiring. Best seen with a guide who can explain the significance of each instrument. Take a guide from inside from the tourism department designated guide. The souviner shop inside the Jantar mantar has some cool things. I picked up an adult pattern colouring book that I’ve not seen anywhere. Their notebooks and coasters are also cool and quirky. Also outside the Jantar mantar there is a bindi seller who sells colour in tiny plastic vials which women can use to adorn their forehead. Metal patterns can be dipped in the colour and put on the forehead. Something I have not seen anywhere else. Take an e-rickshaw for going around the various places of interest. It was heartening to see a lady drive the e-rickshaw. Since they went by number we did not get to ride with her but she was an inspiration!