12/21/2011 at 04:00 PM EST
As family photos from Charlie Sheen and Denise Richards's vacation with their girls trickled in this week
on their respective Twitter feeds and WhoSay pages, one snapshot was definitely a keeper: a pic of the clan swimming with a friendly dolphin!
"Just when we thought the trip couldn't get any better... we met Nuna..!!" Sheen wrote on his WhoSay site
The group, including the ex-couple's daughters Lola, 6, and Sam, 7, and Richards's recently adopted 6-month-old daughter, Eloise, has been soaking up the sun at an unnamed tropical location for the past few days – and it sounds like they're making lots of memories.
"All in the family a Christmas.... to remember..!" he wrote on WhoSay