Goodidea
Spend time in sauna instead of waiting for your hotel key as most of them
only allow check in after 2 PM .So go to some sauna have nice shower spend
some time and only go to your hotel when you feel sleepy after making out
with your chosen one.
I've done this quite a few times. My flight often gets in in the morning. So I'll drop off my bags at the hotel then troop over to the sauna. Have my meal there, take a nap and do some work emails. Then shag a girl or two before checking into my hotel (by then often late at night).
Also, for those bros who are relatively new to Asia, go ahead and try as much food on the menu as possible. Most of the food is free and it's a waste if you don't maximize it. Consider it like a buffet.