Paid rent to your vacating date. Check your payment records. Talk with your property manager/owner if you find any discrepancies in your rent payment history.
Cancelled any direct debits that you have set up for automatic rent payments.
Gathered all the property's keys, remotes, access cards – you will need to return all keys including any copies made during your tenancy. This includes letterbox keys and window or security screen keys.
Taken note of the water meter reading on your exit condition report (if you are responsible for water consumption). There may be one last bill to pay.
Organised to disconnect your electricity/gas/internet for your last day.