Picacho State Park Visitor Center

This visitor center is pretty big.There's a gift shop area in the front with shirts, a-la carte ice-creams and sodas/waters, as well as other knick-knack souvenirs. From the huge glass windows, you get a view of the Picacho Peak area while staying cool inside. It was still pretty busy on a weekday.
The people working up front were knowledgeable and friendly.
Past the gift shop, there's a small informational area in the back with some signs and there's water fountains and restrooms.
To get here, you can either park in the parking right as you enter the park, or you can also park in the first parking lot as you enter (Barrett Loop Day Use Area) - and from the first restroom, just walk down the dirt path that connects to another parking lot, and walk up the short Harrington Loop Road (in total a 10-15 minute walk)