Hi Jaydee
When in crocodile country, you need to act as if there is a croc waiting to eat you sitting behind your boat at all times. Mostly there won't be, but there could be. Crocs can hide from you really well. I have had a passing boat spot the croc behind my boat before I saw it.
Tender needs to be as stable as possible, with your boarding procedures as simple and quick as possible, so duckboard/ladder/sugarscoop. The type of tender doesn't really matter, as long as you have the stability. Being able to easily lift the dinghy each night and for passages is important.
And if you are up here in the Wet, it really does rain! This means you need to lift the dinghy each night, get up to bail in the middle of the night, or install a bilge pump/float switch/battery.
Enjoy your time in croc country- it's magic