A pedometer is a small device that counts the number of steps you take. It is also called a step counter. Some pedometers also tell you how far you've walked in miles or how many calories you've burned. But mile and calorie readings are estimates and may not be accurate.
I would do a mountain bike personally, its tougher but If you want to do mountain biking then you're going to need something like that. Mountain bikes have great tires and last a long time. Try Dicks sporting goods or any place like that. But if you want a more comfortable bike then I would look into something that allows you to change the gears of the bike.