Which sentence uses correct punctuation?

we walked through the red oak nature center today; it was surprising how many bicyclists were there.
the play was an actual wedding party, the actors were funny, outgoing, and playful party guests who interacted with the audience.
it was an extremely hot day, 99 degrees with a heat index of over 100 degrees.
we never found the answer to our question, in fact, we’re still looking to this day.