Organic forms

[pluke100]

So I had a change of plan and I'm going to create a sort of a small scale golf course. What's the best way to raise up and lower the sand beds?

Ideally I want a whole mesh so I can fine tune it how I want in the end. I guess for the sand beds it would be better to make geometry lines and use from contours, but i guess that will result in a separate mesh right?

Something like the result i want.