If you are aware that it's private property, and you go on it anyway, you are trespassing.

tres·pass
ˈtrespəs,ˈtresˌpas/Submit
verb
gerund or present participle: trespassing
1.
enter the owner's land or property without permission.
"there is no excuse for trespassing on railroad property"
synonyms: intrude on, encroach on, enter without permission, invade

Last edited by UncleHuck; 02/05/18 05:53 AM.