Brill and Ashendon

start: Oxford, Marston [SP530079]
finish: Oxford, Marston
distance: 59.5 km

This is quite a hilly route. As you can see on the elevation profile, there are hardly any flat bits.

Route map:
This route is also published on MapMyRide

Around Otmoor

start: Oxford, The Plain [SP522060]
finish: Oxford, The Plain
distance: 36.2 km

This easy cycling route will take you around the low lands of
Otmoor, North of Oxford. The route is mainly flat with two minor
climbs, one getting into Elsfield and the other in Horton-Cum-Studley.
I recommend this route for beginners or for anyone who is looking for
an easy start of the cycling season. There are at least three pubs along this route so there's no need to get thirsty.

Route map:

This route is also published on MapMyRide