Today, visitors camp where farmers once worked the fields. Cottonwood Campground has 35 sites, but is the most primitive of Big Bend's "developed" campgrounds. There are no hookups or dump station. The campground has pit toilets and running water (although it is a good idea to bring your own drinking water). Cottonwood Campground is a popular place for birdwatching and, occasionally, solitude.

The La Harmonia Company Store is still in operation, although these days it caters to visitors instead of farmers and ranchers. The store is open from 10 a.m. to 6 p.m. daily, closed for lunch. Prior to the closure of the border crossings in the park in 2002, many of the people from the village of Santa Elena, Mexico shopped and received their mail at the La Harmonia Store.

From November to April, volunteers and rangers present interpretive programs including guided walks, and evening programs (check the weekly activity schedule posted at visitor centers and campgrounds throughout the park). The visitor center at Castolon is also open seasonally during this time.

A Castolon Historic District guidebook is available for $1.00 at the visitor center, or from the La Harmonia Store.