About 35km south from Deloraine (along the A5) is Pine Lake - located in the Central Plateau Conservation Area. The drive here has some great views and scenic spots to stop off at along the way.
Pine Lake is a truly wheelchair friendly walk - all boardwalk and completely flat plus you are surrounded by spectacular views. The only downside is we found it a little short as it's approx 800m return.
Dogs are allowed off lead under effective control - however they MUST have a PWS tag/permit.