The only thing I know about Garrison other than it being the place where my aunt & uncle choose to spend their weekends is that Gov Pataki lives there.  While it does not have a real downtown, it is home to many culture and nature hikes.  It is also an easy Metro North ride from Grand Central (~1 hr) and close to its charming neighboring town - Cold Spring.  If you have more time, you can visit Hyde Park while you are there.

Day 1

• Arrive in Garrison or Cold Spring (CS is one stop away from Garrison)
• Look for a suitable accommodation on Airbnb as there are only 3 BnBs in Cold Spring
• Constitution Marsh Trail (~1.2 mile RT; easy)

• Walk around downtown Cold Spring
• Dinner @ Riverview Restaurant

Day 2

• Manitoga / The Russel Wright Design Center
  • Visit Manitoga, the House, Studio and Woodland Garden (Guided tour $20 Friday to Monday only)
  • 3 different hiking trails (0.74 miles to 1.15 miles; easy; suggested donation $5)
• Graymoor, The Holy Mountai
• Lunch @ Thayer Gate Deli & Cafe
• Guided tour @ West Point (9:30am-3:45pm; you can choose 1 or 2 hr tour, call ahead to make sure the tour is on)
• Dinner @ Hacienda Mexicana

Day 3

• Anthony's Nose II trail (2.6 miles, moderate; park at GPS coordinate 41.31227, -73.96485; see cover photo)
• Boscobel House and Gardens
• Blue Mountain Park (if time permits and you have a car, stop by to take photos with ducks)

Other points of interest

• Cornish Estate Trail Loop
• Stonecrop Gardens (closes Sunday)
• If shopping is your thing, stop by Woodbury Commons
• Castle Rock Unique Area
  • 0.7-mile Gazebo Trail
  • 2.8-mile Sugarloaf Hill Trail