The weather is great! Take your bike and pets to the park. On your way, explore Earth Day activities all over the NYC. There are tons of great, green events all throughout all the five boroughs. 
Manhattan
Everything’s Grand
Take the train to Earth Day New York’s Annual NYC EarthFair inside and outside the Grand Central Terminal. There are lots of kid friendly activities, including books, nutrition and outdoor concerts.
Where: Grand Central Terminal, 87 E 42nd Street
When: Fri-Sat, April 19-21 (inside in Vanderbilt Hall) and Fri-Sat, April 20-21 (outside Grand Central).
Bright Lights, Big City
Sometimes it’s fun to play tourist. Head to Times Square, enjoy the exhibits, green vehicle display and fun concerts, including Broadway performers.
Where: Times Square
When: Sat, April 21
Go Big, Go Sustainable
For a veritable explosion of activity, go to the New York City Green Festival at the Jacob Javits Center. Come check out a host of exhibits and excellent featured speakers, including Van Jones!
Where: Jacob Javits Center, 655 W. 34th Street
When: Sat-Sun, April 21-22, 2012 from 10 a.m. to 7 p.m.
Bronx
Plant Trees by the Riverside
Bronx River Alliance volunteers will plant native plants and shrubs donated by Million Trees NYC along the waterfront to green the park and protect the Bronx River.
Where: Shoelace Park - 217th Street at Bronx Blvd
When: Sat, April 21 10-1pm
Brooklyn
Green goods in the heart of BK
Celebrate the Earth in Green in Bklyn - a great one-stop local eco shop. They have a full day of activities planned including community gardening, vegan treats and local honey tasting.
Where: Green in BKLYN, 432 Myrtle Ave
When: Sun, April 22
April showers bring May flowers
Celebrate Earth day in May at the fifth annual Go Green! Greenpoint! Earth Day Festival in McCarren Park in the center of Greenpoint & Williamsburg, Brooklyn. Bring the kids and dogs to this great community event complete with educational exhibits, arts & crafts, children's activities, and live music.
When: Sat, May 5, 11 AM - 5 PM
Where: McCarren Park, Brooklyn
Queens
Flowers for princesses and princes
Wander through the Queens Botanical Garden with your little ones. Head to the Earth Day children’s activity table, free with admission.
Where: Queens Botanical Garden,
43-50 Main Street,
Flushing
When: Sun, April 22, 1-4pm