Two sets of photocopies of all of the above, plus a photocopy of related medical and/or trip insurance coverage and prescriptions (carry one set with you, leave one in the hotel room)
Important phone numbers for your doctor, credit card companies, etc. (in case your cards are lost or stolen)
Luggage ID tags and travel locks
Medications/Contraception
Glasses
Contact Lens Supplies
Personal Toiletries
Comfortable walking/sightseeing clothes and shoes
One to two nice outfits for going out to dinner
1 or 2 Swimsuits
Sunscreen and Lip Balm
Aloe Vera Gel or Lotion (in case of sunburn or other skin condition)
Camera/Film
Insect Repellent
Sunglasses
Paperback books
Canvas tote bag
Travel Guidebook
Electrical Converter/Adapter
And for added romance, don't forget the...
Lingerie
Bubble bath
Massage oil/lotion
Your favorite romantic songs and an MP3 or CD player