Directions & Discount Coupon
If you click on the link under the map you can ask mapquest for specific directions from your location.

 
Directions from Interstate 495 (exit 55)
Take exit 55, Salisbury-Boston, Route 110. At end of exit ramp bear right - follow Route 110 to the second set of lights. Go straight for approx. two miles until road forks. Stay right/straight and take a right at the lights onto Route 1 South. Follow for another two miles until you approach bridge crossing the Merrimack River. Once over bridge stay to the right and exit. At bottom of off-ramp, take a left. This is Merrimac Street. Go approx 1 mile. Just past the Fitness Factory (on your right) turn left into the alley at the sign with a whale tail on top that says "Newburyport Whale Watch & BOAT CAMP."

Directions from Interstate 95 north & south (exit 57)
Take exit 57, West Newbury-Newburyport, Route 113 (High St.) heading east toward Newburyport for 2.5 miles. Turn left at the flashing light onto Green Street. Follow Green Street to end (about .2 mile). Turn left and then a quick right into the alley at the sign that says "Newburyport Whale Watch & BOAT CAMP."

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Coupon
 

 One coupon will cover each adult, so no need to waste ink.
Neither the am or pm trips have an advantage in terms of sightings, but there are almost always fewer people on the morning trips and less traffic on the highways getting here. So, sail in the morning and save!
Note that the discount is for full fare adults.