A couple of acres of fenced in dog park for dogs to roam off leash. Open dawn to dusk. Has poo pickup bags and garbage cans provided. Doggie drinking fountain. Double gate. Chairs and tables. Location: Off of I-80, just west of Vacaville in Solano County, CA. Take the Pena Adobe exit and follow directions to Lagoon Valley Park. As you are driving in, you can’t miss it. Directions: West of Vacaville in Solano County, CA. Take the Pena Adobe exit and follow directions to Lagoon Valley Park. As you are driving in, you can’t miss it.