The first time I went to Brunei was in 1983, with an English mate off the rigs. Having been to Bangkok, Singapore and Sumatra, we were going to visit some friends who were working for Shell in Seria. While queuing at Immigration in the then non-air conditioned airport, we were chatting about our plans, when a much older and fatter American guy started speaking to us:
"Did I hear you guys right? Have you come here on holiday? Are you crazy?"
We confirmed that we were indeed there to stay with friends for a week. The American replied:
"I first came to this craphole 20 years ago, and it's still a craphole, I hate the place!"
I guess he must have had some business there if he felt so strongly about the country yet was still queuing to get in at Bandar Immigration, lol. Anyway, we had a great time, alcohol was only forbidden for Muslims back then, though most places didn't serve it as there was simply no demand. Employees could buy as much booze as they wanted at the company store in the Panaga Club, and I found a shop run by a friendly fat Chinaman down in Kuala Belait who sold cheap beer. Over the next three years, I returned twice to visit my friends, and enjoyed every minute of it. Brunei is a bit limited in what you can do, but Miri in Sarawak isn't far away and is much more fun. We visited the Niah Caves and stayed with friends working for Sarawak Shell Berhad. Brunei was also a good location for seeing Sabah, probably the most interesting part of Borneo. Spend a few days on Labuan island, visit Kota Kinabalu, go to the national park and climb Mt. Kinabalu which is well over 13,000 ft high and has its own microclimate. Then on to the orang utan sanctuary at Sandakan. Brunei's much stricter nowadays about drinking, and I certainly wouldn't enjoy it very much, but 40-odd years ago it was a pleasant, quiet, off-the-track place to spend a few relaxing weeks. I'm not sure Thais will enjoy it though, unless they're devout Muslims, Sarawak and Sabah would be much more fun and interesting.