Sightseeing is best done either by tour bus or by bicycles.

观光最好要么乘游览巴士，要么骑自行车。

《柯林斯英汉双解大词典》

Why hadn't anyone advised us that the travel agency can't refund your money unless the tour operator can get the passengers' fees back from the reserved hotels, the tour bus company and so on?

为什么没有人告诉我们除非旅行社能从预订的酒店、旅游巴士公司等地方收回乘客的费用，否则旅行社不能退款？

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We can take a tour bus.

我们可以坐游览车。

youdao

Visitors find it much easier to take a popular bus tour and see Barack Obama's best-liked places around Chicago.

VOA: special.2009.01.12

It's the difference between the idealised rural England (slivers of tour-bus Oxfordshire) and the real countryside of bungalow-sprawl, derelict factory units, impromptu rubbish tips in woodland glades, sinister hamburger-tossers in laybys, empurpled stand-offs over travellers' sites and local people who find themselves stranded by everyone from bus companies to banks.

BBC: News

Mr Hutchinson described the vehicles as "somewhere between a walking tour and an open-top bus tour".

BBC: Cambridge tricycle plan angers taxi drivers

The bus will circle Transport for London's (TfL) office on Blackfriars Road before beginning a two-week tour of bus garages, the union Unite said.

BBC: Bus drivers on open-top protest bus