Whats best for a buggy to run on?

I.e.. Short grass? Gravel ect?

The buggy I have is this - http://www.********.co.uk/proddetail...169c78cf1eb2e5

I used to have a Thunder Tiger DT10 stadium truck, which made easy work of most things as long as they wern't any bigger than a building brick...

So what would you guys suggest for me to look out? Empty short grass fields? Gravel car parks?

And how can I tell if my buggy is using second gear? Is it automatic without a shift? Or should I notice a drop in revs? And then an increase?

Cheers for any responce's!

Jack