Use the money for keeping Ag land in agriculture and pasturing livestock in the moku of Ko'olauloa first. A few trees or a bike path in the city is a drop in the bucket...we must prevent  rural Malaekahana's Gunstock Ranch from becoming a new city.  That would be urban sprawl at the furthest point from the primary urban center...the cost of which is enormous to the environment, to the value of its beauty to the visitor and TV/Movie industries,  causing more emergency services  problems on the single access road - two lane Kamehameha Highway- for 35+ miles that is already overwhelmed by traffic and high wave erosion...
     I wish the money could buy Kualoa Ranch too, (and  possibly building LAGOONS along the shoreline  thru Ka'a'awa),  so it is preserved as the other major open space on the windward side of  Oahu. Lots of Honolulu people come to Kualoa Park as it is. This area and the North Shore hold  major benefits for recreation for townies; and residents OUR need bike paths badly.