The Hollywood reservoir is hidden in between the Hollywood hills- it’s never busy and the 3 mile loop is always peaceful and great for self reflection meditation.
The Rose Bowl happens in Pasadena. The Flea Market is only once a month, its usually the second Sunday of the month. Its a great place to find vintage clothes, antiques and rare treasures. I once found an amazing David Hamilton book that I bought for $15 when it was worth $500.