Public parks are at their best and getting better in April. Plan a day trip with your kids. Pair younger children with older siblings (or an adult) and send them on quests to find things in the park, perhaps a certain color flower or a stone bench. An old cell phone is great for snapping pictures of their finds. You can call your local parks department ahead to find out what's blooming or other interesting things for your youngsters to discover.
Does your child's classroom have a group pet? A fish or a hamster? Talk to your child's teacher about what will happen to the pet over the summer. Perhaps you could adopt it for June, July and August. It might even become a permanent part of your family. Who knows?
Get an early start on your spring garden with black plastic. Even when the air temperature rises, the ground can be cold, preventing seeds from germinating. Warm it up by covering it with black plastic sheeting on sunny days. You can use a soil thermometer to monitor the results.
April is the month weeds come alive. Slugs and snails, also. Don't forget to spray for blackspot on your roses. Catch it now, and you'll enjoy blooms all summer long.
It's time to get those fruit trees in the ground. Dig your hole twice as wide as it is deep (for roots to spread!) and work peat moss or other organic filler into your soil when backfilling. You can expect a bumper crop come fall!