The more you can run from 12v the better in terms of power use, but thigs like
charging cordless drills are difficult to do without AC power.
If guests bring phones
computers etc these can also be charged, but long term you are better getting 12v adapters.
Unfortunatly running high demand
appliances like toasters needs a big inverter, a big
battery bank, and a means of replacing the power drawn from the
battery.
Note you need all three requirements, which not many small
boats have. Just a big inverter is not enough.
We don't use ours much
A stick blender
Charging
camera batteries
Sewing machine
Running some power tools like corded drill, angle grinder, Dremel
Soldering iron