If you want to spend a lazy day enjoying a beautiful scenery, you should go to Norfolk Botanical Gardens. You can be adventurous and sign up for the classes which they offer... it's a great way to spend time with the family and receive a souvenir in doing so. The classes are pretty pricey though. If you plan on incorporating the classes in to your regular schedule, it might be wise to sign up for a meembership. That way, you can receive a discount.
On the other hand, if you're there to visit the flowers, trees, and the wildlife, there are many different array of gardens to satisfy everyone's taste. I love the Fragrance Garden; just a reminder, do take your allergy pills if you have allergies before coming here. The landscape and hardscape is beautiful... if you're a homeowner, you can get lots of ideas here before you start/change your own garden.