If you want an interesting scenery, I suggest the beaches down south, south - south, like around Chincha. You get a beautiful mix of sand dunes, beaches and if you want also pictures of customs of parts of the town.
The anticyclone phenemonon goes down to Cañete, you will clearly see de difference in the sky color.
If you want to enjoy the beach as well as the photography, do go north. You should not experience the same weather as Lima, as our weather is do to the anticyclone.