90.74300°E is wrong.
This mountain is in the Western Hemisphere!
Should be -90.743 (i.e. 90.74300°W)
Please make the change
Oops, thanks for catching that. Forgot the - sign.
This page has seen huge improvements in the past couple of years. Here is a little something I wrote about the hike:
A major landmark is a large gorge created during the earthquake of 1541 which opened the lake at top of the crater, (hence the name Volcán de Agua) and destroyed what was then the capital of Guatemala, Ciudad Viejo. Agua’s summit now boasts a massive crater including a soccer field and a shelter. No association has yet taken charge of Agua, and it is therefore recommended to ask about safety before climbing, especially if without a guide. Several manned huts exist on the volcano’s summit, and are a decent option for a potential site for emergency shelter.
Apparently there have been some "security issues" (i.e. robberies) on the mountain and even the guides don't climb it anymore. Sad, but it might be worth mentioning on the page.
Also, there are convenient shuttles from Guatemala City to Antigua, which are cheaper than taxis, but are quite nice and well organized.
How do you get in touch with the police to escort you up?