It’s beginning to look a lot like Christmas, everywhere you go.  We’ve rounded up the 3 best holiday activities of this weekend: Dyker Heights: If you want to see some of the best Christmas light displays in NYC, go to Dyker Heights.  This is a must do at least once during the holidays!  Look at the houses between 10th and 12th Ave. and 81st – 85th Sts.  The best decorations and lights are located in between 11-13th ave. and 83rd to 85th Sts.  Come between 5-9pm for the most intense lighting.  The best displays are on the weekend. New York Botanical Garden’s Holiday Train Show: This is one of the most popular events in NYC and this year it has expanded by 3,000 sq. feet.  Model trains zip through a display of 150 landmarks all made of bark, twigs, stems, fruit, seeds and pine cones.  To avoid the crowds, go on a weekday or early morning.  The train show runs until January 18.  It is closed on Christmas Day and open until 3pm on Christmas …