During this trip in early April, the weather was uncharacteristically warm. I was very pleasant in a short sleeved shirt and jeans (really only because I was going out). During the daytime, shorts were perfectly acceptable. I would also recommend that some people bring along a light windbreaker.
Miscellaneous: Absolutely essential that you bring sunblock... it was quite warm, and I could feel my face getting plenty of sun! Also, bring along alot of water!
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