I don’t have my physical cards with me right now, but this looks like fun! I’ll use my digital ogham for now and maybe pull a card from a different deck later 
I asked the same question as you – if I was invisible for a day, what would I do?
I got Gort - Ivy.
Gort is cultivating a feeling of home, peace, and safety, allowing the gardens of our hearts and minds to grow beautifully and uninhibited in their glory.
Well… 
without getting too much into it, this makes a lot of sense for me, at least for where I am right now. One of the keywords for Gort is peace, and I can tell you that if I were invisible, I would find a nice meadow or natural place to go to and just exist. No one would know I was there, no one would need me, no one would ask me to do things for them… just existence in peaceful bliss… 