Swimming with dolphins would count as a very legit first time and I think it would be so cool! I think in your case it was cooler than cool [a temperature/state of being that I'm not even sure existed prior to your dolphin comment] because it was in the natural environment. What a very cooler than cool thing.
I'd like to swim with dolphins but I'm not the best swimmer in the world...I mean I can do it but not so well. It's the floating I have an issue with...I can't float. Lol.
Like you say, there are so many first's in life and we need to embrace them. I guess some go begging though as we may not appreciate them fully appreciate them at the time.
!ENGAGE 20
Moments with no camera, embedded into your memory how efficient they are in water and most definitely have a good sense of humour! They sure showed us a thing or two about catching a wave and body surfing.