I find loose fabric over legs a lot more comfortable than thin tights when it's hot out. I really like the Sugoi Bravo Capri pants, they're a very light breezy stretchy material. They're my favorite pants for hiking in the heat, as well as to slip on over bike shorts.

I'm not sure how much sunlight the lighter colors will block, though, since they aren't explicitly spf rated. Sugoi also makes some full-length non-capri pants but I couldn't find them online at TE, I think I've seen them at REI. I am fine with the capri pants because I'm short and the "capris" are more like highwaters on me.

You could wear them over the mesh padded liner shorts like the Ricaro2 short.