thanks all for the thoughts. i've read up enough to see the biz lounge sleeping rooms seem preferred; i also have a priority pass and saw that the lounge there is supposed to be nice and also has sleeping rooms. so i guess a bit to explore in the airport when bored. hoping i can arrive and eat in the first class lounge as it seems the most exciting to try things in.

i actually used to travel with a car helmet (literally just stopped last flight) - there is a kart racing place just outside of the airport here, so arrive kart and eat would be viable, although still not sure i could get back into the airport being so early then for my flight (although since i already have the ticket, it would seem that would be ok?). looking forward to the trip and experience!