It has been really hot and awful around here. Being a Florida transplant, I have learned to wear jeans even when it's 90. Of course, if I was about 50 lbs thinner, it would be much easier for me to opt for shorts! That said, I don't think you really "need" pants for anything. It's hot! The coolest it gets around here is in the high 70s, and that's at 4:00 in the morning!

Except for the breezes off the ship in the evening (which I doubt will make it COLD), I am guessing you'll be fine without pants.