There is also a free dump station in Mission Bay (San Diego). Nearest Dump/Water: Lots of dump stations around San Diego. Possibility to stay longer if you request it. Link to map location HEREĬost: FREE (overnight). “Freebie” Site Review – Sycuan Casino, El Cajon (San Diego), CAĪpby libertatemamo 14 Comments Hiking the hills near Sycuan CasinoĪ very spacious free parking spot ~20 miles East of San DiegoĬoordinate s: 32.787428,-116.826650.