Great post. Very relevant in summer. Ayurveda, an indian science, has a lot of natural remedies. Just wanted to add a few more to compliment your post -

Ghee or clarified butter is excellent for sunburn. In fact it is a great lip balm as well. Even coconut oil or shea butter are excellent remedies for heat burn, as i have benefitted myself ftom them.

A mixture of tumeric and sandalwood can also help. Tumeric in fact is a remedy for almost any ailment you have.