Since you are staying for only 5 days you could indeed do the Jolly Pirates swim snorkel and swing tour. You could also do the half day ABC jeep safari, or their new Batumba tour. I strongly recommend these activities. Check out their websites...
www.jollypirates.com www.abc-aruba.com, you'll have a great time.
You could also learn to dance on your vacation! ArubaSalsa is a brand new activity on Aruba where in one hour and a half you could learn the Salsa, Merengue or Bachata. Greetings!
Reggie
reggie@arubasalsa.com