WOW!!!
With so many truly great par 3's how can anyone pick just one. The 14th at Monterey Peninsula, 16 at Cypress,
7 at Pebble, Pine Valley, Sand Hills, Gulph Mills, Aronimink, Merion, Baltusrol, etc. etc. etc. All have great par 3's.
Some that don't show on any list that could make at least honorable mention at least in New England are:
No. 9 at Winchester
No. 11 at Charles River
No. 8 at Brae Burn
No. 3 at Wannamoissett
No. 11 at Salem
The list could be endless
Best
Dave