Not only will you be responsible for paying the bank fee for a returned check, but your landlord can legally charge you for this in addition to any late fees that might apply. Be responsible enough to approach your landlord and explain the situation. If you can, explain to your landlord that the problem is only temporary due to the holidays. When asking for an extension, be reasonable in your request. Don't expect your landlord to accept a payment two weeks late with no qualms.
Landlords have payments to make, too.
If you absolutely cannot make the full payment within a few days, try to pay at least a portion of it. If you can do this, the landlord may be able justify a longer extension. If this is the first time you have made a late rent payment, and you have been a good tenant up to this point, the landlord will not want to lose you. Most landlords would much rather accept payment a few days late rather than waiting weeks to find new tenants. Eviction can be expensive and inconvenient for both you and the landlord.