The Austin Chronicle has an article about Bell campainging on the issue. It has some info that might be helpful:
Bell Blasts Perry for Underfunded Parks by Amy Smith
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Standing before a pooled area of Onion Creek, Bell accused Perry of failing to honor the wishes of voters, who in 2001 approved $101 million in state bonds to pay for park improvements. Since then, Bell said, state parks received just $36.7 million in bond money for 2001-2002, followed by zero dollars in the 2003-2004 budget cycle and only $18.1 million for 2005-2006. "Texans went to the polls and voted to fund our state parks, but Rick Perry has defied us and is blocking these funds while our parks waste away," Bell said.
The park system's funding problems began long before Perry took the helm. In 1995, the Lege placed a $32 million cap on the amount of funding parks would receive from the sporting-goods tax. But Bell faults Perry for perpetuating the park system's declining health while overseeing a state budget that has grown 42% under his watch. Nationally, Texas ranks No. 49 in per capita spending on state parks. Responding to recent criticism over parks funding, Perry said he would sign legislation to eliminate the $32 million cap and boost funding for the beleaguered park system. But Bell believes Perry's preference would be to privatize the park system altogether, despite numerous polls that show voters overwhelmingly support leaving Texas parks under public control. ...
A recent study commissioned by the Texas Parks and Wildlife Department painted a dismal picture of state-owned public lands. An additional $25 million per year is needed for day-to-day operations, the study reported, while an extra $100 million would be required to restore parks to modern-day standards. That's not all – parks on the critical list need some $500 million to cover major repairs, plus another $40 million to cover a backlog of road-repairs in state parks.