Getting to Blackgang Chine is pretty straightforward from Southampton.
On foot - hop aboard a Red Jet Hi-Speed passenger sailing from Southampton to West Cowes (it takes 23-25 minutes). On arrival in West Cowes, Southern Vectis operate frequent buses from West Cowes to Newport (service 1). Change at the bus station in Newport for service 6 to Blackgang. Taxis are also available outside the East & West Cowes terminals. For car hire, we recommend Enterprise - they will pick you up from either terminal if you tell them your arrival time.
By car - catch the hourly Red Funnel Vehicle Ferry sailing from Southampton to East Cowes, the crossing takes 55-60 minutes. On arrival, head south along Dover Rd, take Castle St to Well Rd/A3021, follow A3021, A3054 and A3020 to Niton Rd in Rookley. Continue on Niton Rd to Godshill, continue on Appleford Rd and then tke B3399 to Blackgang Chine (PO38 2HN). The journey will take 30-35 minutes.
See here to book your ferry.