Brunei has no train network and public bus services are infrequent and limited. Buses in Bandar Seri Begawan cover the main routes but run on no fixed schedule — they leave when full and most routes stop operating by late afternoon. For exploring the capital, the service is usable for short hops at a low cost, but do not rely on it for anything time-sensitive.
Taxis are the most practical option for visitors. They are not metered, so agree on a fare before you get in. Ride-hailing apps (including a local service called Dart) now operate in Bandar Seri Begawan and take the negotiation out of it.
Car rental is widely available and the roads are in excellent condition. Petrol is heavily subsidized, making driving unusually cheap. Having your own vehicle is particularly useful for reaching places outside the capital — Seria, Kuala Belait, and the overland route to the Temburong district all benefit from it.
Water taxis cross the Brunei River between the city waterfront and Kampong Ayer, and regular boats connect Bandar Seri Begawan with Bangar in the Temburong district. The speedboat journey up the river takes around 45 minutes and is the primary means of reaching Temburong without going overland through Malaysia. Longer-distance ferries also run to Labuan and onward into Malaysia.
Getting to Ulu Temburong National Park requires a longboat from Bangar, organized through a tour operator. Independent access is not permitted — you must book a guided tour from Bandar Seri Begawan.