Wannamoisett has a lone par 5, today, though the original routing played the long 2nd hole as a par 5. I'm fairly certain it played as a par 5 during the 1931 PGA, but I'm unclear as to when it changed to a par 4. But today, it's a par 69 with just the par 5 17th
I remember a few years ago getting a call from a friend who said he just got to play Wannamoisett and didn't know what all the fuss was about on the 2nd hole as "I made 5". I told him that was great but that the hole was a par 4. 
Ganton has three Par 5's but one of them is quite short, around 438 from the visitors tees. I played there for a week in 2012 and kept hitting into the numerous bunkers on the hole, racking up 6's and 7's and "others". Finally on my very last round I hit the fairway with my tee shot, hit it again with my second and knocked an 8-iron onto the green about 10 feet from the hole.
Here's the thing. I had been thinking all week it was a Par 4. And it was the only hole I had not parred at least once. So when the putt misssed I tapped into for 5 and told the member I had joined up with on the first tee, "This is the only hole I can't figure out how to make par". He pointed out that it was, in fact, a Par 5 and I'd just parred it!
Guess it serves me right for not carrying a scorecard.