Start with a visit the Royal Aruba Aloe Factory Museum & Store - they have plants spread out over their 150-acre plantation which is incredible to see. 
They give tours every 15 minutes where they show you how they get the aloe out of the Aloe Vera plants and you can see the different sections of their working factory. You’ll end in an amazing gift shop which is a pretty great place to do some shopping! If you sign up for their emails - they send 25-30% off discounts all of the time and ship out of a U.S. location to save on shipping so you can get their products after you get back home!
Next, take an afternoon and head down to San Nicolas and check out their street murals from artists all over the Caribbean. 
You can take a guided tour if you schedule ahead of time or just take a photo of this self-guided tour and see them on your own which is super easy to do. 
They are all close together and it is so fun to walk around the town and find them. 
Grab ice cream in the Kulture Café to cool off and relax when you are done.
Schedule this next one ahead of time to make sure they don’t sell out! 
The Jolly Pirate Tour is a fantastic morning or afternoon aboard a pirate ship in the Caribbean. 
Our tour stopped at 2 different locations to go snorkeling – an Antilles Ship wreak and Arashi Reef. 
My kids had so much fun swinging on their rope swing & jumping into the ocean from the boat. They served a really good lunch and we all had a fantastic time.