The suspect is described as a 30-year-old Hispanic male, 200 pounds, with a muscular build, a large belly, a round puffy face with pimply cheeks, brown eyes and short black hair.
Authorities say he was wearing a white t-shirt, corduroy pants with wide stripes, and work gloves. He also smelled strongly of alcohol.
Investigators say two Sundays ago, the man entered a trailer at Lake Solano Park between about 3p and 4:30p and assaulted a 50-year-old woman.
The suspect stole about $200 and a small safe before fleeing.
Anyone with information on the suspect is asked to contact Solano County authorities.