Firewood should be neatly stacked. Barbecue grill should be cleaned. Attach the downspouts to the gutters and paint if needed. Any loose roof shingles, tiles, etc. should be secured or repaired. Paint the front, side and back entrance doors.
Nothing looks worse than a peeling door.
Buy a new mailbox without graffiti on it. Paint all chimneys and replace broken brick or stone. Remove any or all evidence of leakage by whatever means possible. You may have chuckled or frowned after reading the above list.