Finally! A deck that isn't built around the latest set! Though now that I have finally gotten some Apocalypse (I've been Apocalyzed?) I should theoretically be able to contribute to the other threads. But I digress...
Welcome to the CPA, but I meet your deck with a question or two -- what format do you usually play (type 1, 2, extended, etc.) and is the deck for multiplayer or duelling?
Judging by your deck contents, I am guessing type 1, both duels and small chaos games (3-5 people). I will keep it to only green cards, playing off of the "benefit from forests in play" theme you have already posted.
For the first example, the Skyshroud Sentinels, Nesting Wurms, Howling Wolves, and the Pack Hunts need to go. Likewise go the Spellbooks, Whip Silks, Thicket Elementals and a Vitalizing Wind.
To replace them, add 4 Yavimaya Elders (this 2/1 costs 1GG to cast, can be sacrificed to draw a card, and when it hits the graveyard from play, you go through your library to put two lands in your hand), 4 Llanowar Sentinels (a 2/3 elf that costs 2G to cast. When cast, you can pay 1G to pull an additional Llanowar Sentinel out of your deck and put it into play), 4 Pincer Spiders (2/3 can block flying creatures as if it had flying, paying kicker makes it bigger), 4 Lone Wolf (a 2/2 that can redirect its damage to a player), and 4 Blanchwood Armor (creature gets +x/+x, where x = number of forests you control).
This results in:
4x Yavimaya Elder
4x Llanowar Sentinel
4x Pincer Spider
4x Lone Wolf
4x Silverglade Elemental
4x Stampede Drivers
4x Hunted Wumpus
3x Rooting Kavu
1x Craw Giant
4x Skyshroud Claim
4x Blanchwood Armor
1x Vitalizing Wind
17x Forest
4x Hickory Woodlot
For 61 cards. If anything, you will fast run out of forests to fetch...
Its a fast remake, though I am sure that others will provide you with totally different approaches to a green decks. As I type this, I can think of numerous other ways to benefit from all that land (not much of it tourney quality, though.)
Hope it helps.