You'll never feel good about it. Also, don't add on services that the client really doesn't need. Charge for the effort expended . You can justify charging the full price or you can buy surprised respect from your client by charging for only what was required. Charge only for reasonable expenses .
Expenses are minor items that can easily lead to a distrustful relationship.
Don't take a limo if a taxi will do. If the answer is no, it's probably not a reasonable expense. Charge for expenses actually incurred . Travel expenses should be charged at cost and verified with receipts. Don't exaggerate mileage.