Northumberland has a variety of family-friendly accommodations.
There are many cottage rentals on Rice Lake as well as RV and tent camping. Camping is also available at both Ferris Provincial Park and Presqu'ile Provincial Park, and in the interior of the County lies Castleton Hills Park with a large, picturesque pond.
Here are some other ideas:
Campbellford River Inn features a large outdoor pool overlooking the Trent-Severn Waterway, a National Historic Site of Canada. The inn is located right on the river banks providing excellent fishing. Visit the locks, Empire Cheese, World's Finest Chocolate or Ferris Provincial Park.
Breakers on the Lake will allow you to fall asleep to the waves and wake up to a private beach on the shores of Lake Ontario. Located at the east end of Cobourg's beach you will be close to shopping, dining, and many events that take place all season long.
Best Western Plus in Cobourg has all the amenities; an indoor pool, splash pad, hot tub and restaurant onsite. Situated in the heart of Cobourg you will be close to shopping, dining and entertainment.
The Comfort Inn in Cobourg and The Hampton Inn in Port Hope are both centrally located and are great for larger parties. You can bring the whole family, including your pet (select rooms). All amenities are a stone's throw away from these restful hotels.