The Cambridge University Botanic Garden spreads across 40 acres south of the city centre and is one of the best botanic gardens in Britain — largely because it is a working scientific collection with more than 8,000 plant species, not just a public park. The glasshouses are particularly good, with separate sections for tropical rainforest, alpine plants, and arid species. The rock garden and the lake area are at their best in late spring.
Entry is charged (around £6 for adults, free for children). Open daily except Christmas Day; hours vary seasonally. The garden is a ten-minute walk from the Fitzwilliam Museum and a good way to spend an afternoon away from the college crowds.