A driving range would indeed be great. Maybe a Work-out Area...Driving range, putting green and chipping area? You could set it up in either a "bucket of balls" or a time element thing or both.
Bucket of Balls: I'd pay say 10c for a 200 ball bucket. Then once the bucket is bought it stays in your account until the bucket is empty.
The Time Element: I pay say 10c for an hour work out on the Driving range. That too could stay in your account until the entire hour is used.
Food for thought gentlemen and have a super day!