Well done, buster, you did it all on your own too, remember that! It takes a lot of courage to face these fears and at your early stage in recovery it will be harder.
I'm really glad you enjoyed it too! Staying so long is definitely a big bonus as we tend to be rushing around a lot trying to get through the day.
Now you know you can do it. So, you can do it again and maintain the contact you have lost with your dad because the anxiety has caused you to retreat.
I think the fact you enjoyed it and came back feeling better too is a massive bonus. It could easily have been an anxious event all the way as some things are but you felt the reward and that's very important.
I bet your dad was not only made happy by you making the effort to fight through your fears to see him but that you enjoyed it since he would want to see you happy.