Advice from a 30 year visitor to the island:
Use a small cross body purse or have hubby keep the pen in his pants or shirt pocket.
Just bite the bullet and rent chairs and umbrellas at the beaches.
Lastly- ENJOY every minute of your trip!! <img src="http://www.traveltalkonline.com/forums/images/graemlins/Groovin.gif" alt="" /> <img src="http://www.traveltalkonline.com/forums/images/graemlins/Groovin.gif" alt="" />