Anyone been to India? Any recs and tips?

Thinking about going to India in June.

Probably will spend 7N in Dehli. 2N in Agra, 3N in Jaipur, 4N in Udaipur and 7N in Mumbai.

What things did you do or try that you really enjoyed? What did you hate?

Any tips to make the most of my trip and avoid annoyances?

Some interests will be eating, cafes, sightseeing, and nightlife. Possibly going on a date or two (I am a straight male).