Back yard progress

Ok so i am doing a up date on our yard. I swear it never ends at our house. The yard though..... SO MUCH WORK. Thankfully Adam is awesome and does almost everything but it still takes a lot of time. So far we have build the retaining wall and got the land level. We are doing an under ground tramp. If anyone is looking into doing and under ground tramp we did the frame DIY style because being a under ground tramp frame will cost you at least $600 we paid $100 for ours. Yes it looks getto now but you won't see the metal when were all done and it does the job. I found this guy (http://www.allthingsthrifty.com/2011/05/diy-inground-trampoline-instructions.html) and we have more legs on our tramp so we could not follow his tutorial but used his concept. But we also lined the tramp with rocks so that on the bottom no dirt would fall in as well. Our land is sooo rocky we are on so we did not use the cement blocks because we did not need it.
     Retaining wall is made of 6x6x8 Treated timber. we found the best price was at Home Depot. Our wall goes our entire back yard. We are doing a fire pit area (that will have stairs and a deck soon to come) so it is not just a straight wall. Our wall is about 3-3/12 fee tall. We had to do this to make our yard more level. We had such a slope in the back that was our only option. For our whole wall and material we are at about $2000 that is us doing it our selfs. After we put the the treated timber before we back filled we sprayed a sealer on the wood to help protect it even more then we put a black mesh that we stapled to the back to help keep the water off the wood to make it last much longer. Then Adam rented a bob cat and back filled all the dirt back to the yard. Also before we started we had an excavator come out and dig out our tramp and a line for the whole back yard for the retaining wall that cost use $600 (worth every penny!) Here are some pictures of what we have done so far.