I'll echo what others have said. I love being on a boat, our favorite is Black Pearl. We've done Jolly Pirates and had a blast, but prefer the laid back Black Pearl. But nothing compares to a snorkel with Aruba Bob. Hands down the best thing we've done on the island. It really is about what you're looking for.
I agree with Arubalisa and recommend Tranquilo (http://www.tranquiloaruba.com). Aruba Bob is fantastic for a snorkeling experience, but if you enjoy the sail as much as the snorkel, then don't pass up the opportunity to sail in Aruba (the wind is fantastic!). With a group of 10 people, you have the option to charter the Tranquilo for a private sail and then you can select the itinerary & pace for your trip. I am a huge fan of sailing so whenever I travel to Aruba with more than 8 friends, I always do a private booking on the Tranquilo as the rates are reasonable and work out to about the same as if you participated in a public outing. If you have interest, send an inquiry on the website to Captain Anthony.
Thank you Everyone for the input. We wound up doing a 4 hour snorkel sail on the Tranquilo. It was awesome. Captain Anthony did his thing and Marco took excellent care of our party including excited children and seasick grandparents. The pea soup was So yummy. The snorkeling was good, but we all realized what we really enjoyed most was the sailing. My husband and I even went sans children on a Jolly Pirates sail before we left the island.