It's a 2 hour 30 minute walk, 9 Km. Unless you are accustomed to walking in desert conditions I wouldn't recommend walking to Walvis Bay. It will be very hot. Even when visiting by car wear long sleeved loose top, long loose trousers, must wear a hat, use sunscreen and take water bottles. There is a bar/cafe where you can get food and drinks and there's a toilet for patrons only. The public toilets at the dune are disgusting.

There are normally other people around there too, so I would say so. We took a cab out there, made sure we had his number and airtime to call him when we wanted to get picked up.Take water and some snacks, remember sunblock! and Enjoy!

Yes you can...there is a perfect road to the dune and no need for a 4x4...unless you want to do the 4x4 activity ...

To climb is for free - there are other activities in the vicinity as well.

Yes, there will be plenty of taxis. As a tip, the further you go down the taxi line/away from the ship, the cheaper they are willing to go (usually). I'd also recommend negotiating a rate in advance. Hope you have fun!

Try a taxi. Distance is not far. If there for the day, hire a car.