I'm just back from a vacation in Mexico, where I spent mornings painting on a beach. Amazingly, I was the only person out most mornings! I painted with gouache using Multimedia Artboard paper, which is very stiff and very absorbent without any buckling or warping from applications of paint. The absorption surprised me -- I often found I thought I'd laid down a lot of color only to see it disappear as it dries. I used a clipboard to hold down the 8 x 10" paper and found it was a great painting setup, easy to transport, able to withstand ocean breezes and well suited to capturing the experience of being on a beach on the Pacific Ocean.