We went to Sycamore Hill Farm's open garden day yesterday - what a wonderful place!! They are just west of Marcellus on Old Seneca Turnpike - 33 acres of flowering trees, shrubs, bulbs, fabulous statuary, beautiful ponds, koi, a huge fountain shooting about 50' into the air, a maze, etc etc! Definitely worth a visit next time they are open, when incidentally they are also having a plant sale, on Father's day. I'll add a link below.

Here is a link that might be useful: info on next open garden tour