What to Do While We Wait

Every believer experiences it - periods of waiting on the Lord. We ask Him to work in the life of a wayward family members, a financial crisis, a strained relationship, poor health, but God puts us in a "holding pattern"? What do we do as we wait?
As the 120 followers of Jesus waited in the upper room (as Jesus had instructed) we find several clues as to what might make our wait turn out as God intended.