Wait for spring and take them to the Sierra's. Back in the day, I took my nephew and 2 nieces numerous years, in the spring, starting when they were very young. During that time of year I would not chose a campground until I was there; if you camp to high, it's much to cold for the kids at night and in the mornings. Hit the higher elevation lakes that are open enough to fish. The guys above are correct, when they are young, quantity trumps quality. Most trips, when they were very young, I spent all my time baiting, casting, handing them the rod (they usually already had a fish on in that short time) and putting the fish on the stringer. Once the weather warms, the bite seriously slows. These trips are memories they are still very fond of and will remember for their lifetime. Hell I remember them too, I can still hear my nephew saying in that very young child's voice Uncle XXXXXX, what's a PBJ.