It should actually be written,
That sounds like quite a day.
The meaning here is that the day this person has planned is full of a lot of things, and from the context here, a lot of positive things.
This is a pretty common phrase to describe that your day was busy/eventful/full. It could be positive or negative.
'It's been quite a day...' 'Oh no, what happened?'
"It's been quite a day, hasn't it?' 'It sure has! What a great day.'
Hope this helps you out.