The Juhu one is about 1.5hrs drive from Taj. The Chowpatty one is hardly 10 minutes and can be combined with a visit to the beach and to dinner at Soam. Mumbai's big / popular temples are Siddhi Vinayak (Ganesha temple) and Mahalakshmi (Goddess of Wealth). These are about 20-30 mins from your hotel by vehicle.
What is Ilum? Ilum is a planet weâve seen before in The Clone Wars. Like Starkiller Base, it is a snow-covered planet, but it is also a planet of great importance to the Jedi. Before the rise of the Empire, the Jedi harvested kyber crystals from Ilum to be used in their lightsabers.
I'm sure Obi-wan kept it and it was left behind in his home when he went off with Luke in Episode IV. I like the idea that Luke used the crystal out of Qui-gon's lightsaber when he constructed his new one upon his return to Tatooine before the events of Episode VI. There may be something clarifying all of that coming up in the new Star Wars comic series. # 3 has a bit of a cliffhanger in that regard.