One of Perth's drawbacks is that its people have not embraced late night dining. Very few places will serve food after 10PM, even on Friday or Saturday nights. Most restaurants in Perth do not cater for vegetarians or vegans, and if they do - the range is extremely limited. If you are looking for a place that embraces vegetarian food, Fremantle is great.
local specialities
A large Western Rock Lobster known locally by its former name of crayfish industry. Most of the crayfish is exported to the USA for vast sums of money. However, crayfish prices in Perth can be relatively cheap, especially during summer in a good season. A chance to give it a try without breaking the bank.
Chilli Mussels are a popular local speciality, consisting of mussels cooked in tomato and chilli jus, available in various restaurants.
Truffles are grown around Mundaring.
The ubiquitous fast food chains serve the usual oily stuff.
If you're interested in a gourmet road trip, nearby Margaret River about a two hours drive away is extremely popular for wine tasting, delicious chocolate and fresh, locally made food and produce.