I cruised POA in September. I also didn't use NCL's wifi much, but I also didn't have much connection once we left port (maybe around half hour out is when I lost it). I had 150 included minutes, and I used maybe an hour of that, mostly on the last day. It's a port intensive itinerary, so I just used my phone's signal when we were in port. And then I was exhausted from a day of sightseeing so I didn't stay up too much past dinner. If you are working and need more internet than that, you may want a better package.
As for the excursions, I'd just book it under the name of the person who gets the $$ off. The excursion we took did not look at names ever. They just collected tickets and counted heads.