In reply to climb the peak:
If you like being warm, avoid Stange at this time of year unless there is not a breath of wind. Stanage is more wind trap than sun trap otherwise.
Rivelin is a good option, being low lying, South facing and sheltered - and also very near Sheffield.
Froggatt is also a good option, being low-lying, sheltered (in places) and having some nice bays that face the late morning/ afternoon sun.