Brunei Airport 6 hour layover

Assistance please.

I will arrive at the airport in Brunei at 10 AM and depart at 4 PM. I was considering traveling downtown for lunch and a short walk about.

I assume a taxi is the quickest and most convenient mode of transport however I am asking for suggestions.

What should I expect to pay for travel into town then travel back to the airport in a few hours? Is it realistic to hire a taxi driver to stay with me?

Schonefeld if your out there I'm sure you will be able to assit.

Thank you very much for your help.