You didn't say how much or what it's for, so I'm gonna just through some thoughts out.
A good quality digital camera. My wife just got the Cannon S2 with a 12x optical zoom. It's by far the best camera I've seen!!!
A small paddle boat. Mine is a 10 foot plastic one with a V-tri hull. It's easy to pullout, is very stable and can handle a 5hp motor. I have the motor, but we always have a blast just paddleing around in it. Spring time is probably the best because the kids go crazy with fun trying to catch tadpoles.
A good weed eater with interchangable heads. Once or twice a year I put my hedge trimmer on mine to get the bigger stuff down. I also have a metal blade for the thicker stuff.
One of those floating trampolines!!! Or just about any type of floating raft to play on.
Ducks.
More fish.
Centapede grass seed. It grows super slow, but very thick and green. I want to plant it around my shoreline to cut down on mowing. Eventually it will take over bermuda, but that's gonna be several years.
Picnic table, bench, gazebo, fire ring and/or a bar-b-q grill on a level concrete pad.
Outdoor lighting.
Wood duck boxes.
Automatic fish feeder.
Game cam to take pictures of animals that come to use the pond. I'm dying to see a deer or some hogs drinking from my pond.
A fish cleaning station.
Merry Christmas,
Eddie