Translation of irony in Spanish

We entered the club which started to fill up around mid-night. The atmosphere was great and many handsome men and beautiful women were dancing on the different floors of the club. We were upstairs.
We joined the mass and climbed it. The stones were a little slippery and I doubt that this place is accident free. Climbing big slippery stones was not an easy task but we managed it slowly.
Sorry but I hadn't have enough time in the last two weeks to respond to your email and to your interesting offer. I really need to think about it a little longer, and I am sure you'd understand.