Sorry it seems I didn't see your message, now I saw it, I answer
1- definitly the dates free for Junior suite are 18-19 and 25 between is impossible
2- No normally it is dinner. The price for lunch in $15 (buffet) or by snack
3- No only your agency can upgrade in All In, we can't do it on site
4- No exactly, the floating can accomodate up to 15 pax, BUT you have to be 4 minimum (or pay for 4). You will make the booking on your arrival
5- Plugs are European style see here
https://karafuuhotel.forumactif.com/viewtopic.forum?t=59I will see you in 2 days.
Regards