Hosp Grove was founded by a group of investors called The Hosp Eucalyptus Corp in 1908. They planted 219 acres of trees in this Carlsbad grove hoping they could be harvested & sold to the Santa Fe Railroad as railroad ties. Unfortunately, eucalyptus is a brittle wood and cracks easily, therefore was unsuitable.
Since the beginning, much of the grove has been sold off, but what remains are fun, forested trails with plenty of inclines and twists & turns. Part of the trail is parallel to the Buena Vista Lagoon and offers great views. In November monarch butterflies can be seen in the eucalyptus trees after migrating from northern regions.
Personal Experience: This was a pleasant hike. There are plenty of inclines for building endurance and if you go in winter or spring it should be nice and green. There is nothing ground-breaking about this area that we found, but pleasant nonetheless. This is a big area so there are plenty of other trails that we didn't explore.