You put in a new fence, build a raised garden bed and expand/replant your flower beds, of course!
My dad arrived on Wednesday night for a weekend of work - and work we did. If anyone bought stock in Gatorade last week - we just made you a killing! It was in the mid-90s and humid all weekend and were the fools outside doing hard manual labor the entire time.

Thursday we rented a post-hole digger for the fence. Thanks to the wonder of instant post cement, we were able to put up 90% of the fence that day. The rest we could have finished, but it was easier to build the raised garden bed without those panels in, so we waited.
Now for the fence all we have to do is attach the decorative post caps - and sit and admire it.
Oh, we also have to teach the dog how to deal with being in the yard without her leash. She is at a total loss.
On Friday morning J had to work from 6 - noon, so my dad and I rented a tiller and dug up the corner of the backyard where we were going to build a new raised vegetable garden bed. We also had plans to expand the beds in front, so we figured out what were going to be doing up there and tilled that soil a bit as well. Once J got home we borrowed his dad's pick up and went to get some top soil that my boss had pulled out of his yard (to put in our raised garden). Then we wandered around the nursery and picked out our new plants - which my dad very generously purchased as a house-warming gift. (thanks, Dad!)

Saturday morning we built the raised garden bed and put in the final 3 fence sections. We goofed around in the afternoon (during peak heat) and then got to work putting in the front flower beds until it was too dark to work anymore.
This photo makes our fence look really crooked - and the tops of all the pickets look busted - but I swear it is a very nice fence in real life! (see previous photo)
This morning we had to get up early and finish the front beds. We got 98% of the work done before my dad had to leave for the airport. So we dropped him off and then went to pick up the last of the mulch to finish the beds.
Before:

4 over-grown yew bushes and an unidentified shrub.
After:

Expanded gardens - no more mowing the dirt around the tree!
Left garden:

In the back, under the windows, we have two dogwood bushes. Right next to the step is a hydrangea bush. In the middle we have two other bushes that I don't know the names of (I kept the tags from their buckets so I can learn this stuff before our housewarming party!). We also have a couple of hostas, Stella d'Oro day lilies, another flowering bush I don't know the name of, and a few clearance impatiens for instant color.
Along the walk we have some miniature boxwoods that J is planning to turn into a very low (18") hedge in a few years.
Right garden:

More of the same plants - plus a walkway that is no longer covered by over-grown yews!

This afternoon we planted a few ferns in the backyard. I took a nap and J picked up a little more top soil and peat moss for the raised bed. He also bought a gas-powered trimmer with a tiller attachment to help amend the soil...some other day. We are now
resting!Of course, now that we are done toiling in the yard, the thunderstorms are rolling through and dropping the humidity. Tomorrow is supposed to be about 20 degrees cooler as well. The upside is that I won't have to haul out the hose to water the new plants again tonight.