I agree with Clumber Park (I much prefer it to Rufford Abbey) or Newstead. Both have varying scenes and opportunities.
When we go with the cameras, we always go early - the church at Clumber is great, for example, (although when we went two weeks ago it still had the wire fencing up due to problems with the roof) but it is a shame to have to get loads of people in your shot! - we don't really 'do' people! - It got very busy much earlier than normal when we went (NT 'free' day, although all you pay for there is parking and the walled garden and the first 'spring like' day of the year) and I suspect that it will be the same or worse this weekend.
Vicar Water is good - we went last weekend. For a first time it will give you some good opportunities - the Golden Hand, for example, is pretty good (although slightly marred by vandalism if you get up too close); Great views of the Colliery from a couple of places for different perspectives and the lake - which is small compared to some. There is also a restaurant there but during busy times, like when we ended up there last week, they don't cope too well with high volumes ....that is for information only, as it's run by a charity focusing on disadvantaged youngsters and so not a purely commercial concern. There is some higher ground which may allow for good views on the right day.