Although I rarely usually endorse sports which do not require a bit of sweating, croquet is an acceptable departure. We have the kit for a four man game stored at Barts (you can retrieve it from the new pavilion using your fob), and it can be played on the front lawn. Delightful!
Located a short (by some standards…) cycle ride up Cowley Road is the largest College annexe, which consists of a sports pavilion, two large pitches (one of which is managed by Lincoln College), a smaller field, and a whole bunch of accommodation. Hazel Court is the domain of (mainly) 3rd and 4th year undergraduates, as is Leoline Jenkins House. Thelwall House caters to couples.
Graduate students at Barts typically live in the 3 and 4 person flats in Hugh Price House. There are also a small number of rooms in the Old Pavilion.
The other structures on-site are the Groundskeepers House and the Caretakers House, as well as bike sheds and laundry rooms.