You're post is somewhat confusing. Are you looking for a 'Mountain Bike' to do
this kind of riding around the parks or
this kind? I'm assuming the latter since you're a beginner biker. Is that's the case then when you say 'Mountain Bike', do you mean to say 'Full Size Bike'? as in with bigger 26" wheels instead of the smaller 20" wheels that are found on majority of the folding bikes?