Well, I'm proof that someone can go from "sit around snacking and get easily bored" to "enjoy walks, love getting exercise, and get bored mostly when sitting around and eating snacks".
For walking: First, I'd suggest that you try to find the most interesting or beautiful place to walk nearby. A park, a trail, or some naturally pretty place. Have your kids join in for companionship, if possible. Challenge yourself with a goal (so many miles in a week, a particular distance, so many days in a row) and then reward yourself for making that goal.
Also, mix up your exercise with several options to keep boredom at bay. I walk about 3 times a week, as least a mile. I also belong to a gym, and I play racquetball 2 times a week. Are there any tennis courts in your area? That could be something you could do with your kids, assuming they aren't too young. How about a bit of bicycling. Just the speed can help keep boredom away, and you do get to travel a lot more distance, and therefore get to see more things.
Keep searching, give several things a chance, I'm sure that you'll find the activity that is right for you. But also be strict with yourself. Until you find that groove and start to enjoy the exercise, you still need to set rules for yourself about how long for how many days you'll do
something. Even write down the commitments on a day planner or calender at the beginning of the week, and then check them off when you've succeeded.
Good luck!