I'd definitely bring at least one pair of jeans and a sweatshirt. Granted I'm cold fairly often, but I wore my hoodie a lot in the mornings because it was still damp out and there was a chill, at night especially if there was a breeze, a lot in restaurants and in some rides because of the AC and in the hotel room. It's hard to say what the weather will be like, even if you look at a forecast because things change so quickly. Like I said, I'd take them, if only for peace of mind and so you don't get stuck spending 60 bucks on a sweatshirt in the parks because you're freezing!