I haven't been to Toolangi Forrest/didn't do a forrest for field work. However, in terms of regional forrest use sustainable timber production might be worth a mention in relation to your vegeatation map.
'The township of Toolangi is situated on the edge of the Toolangi State Forest. Not only is this Forest utilised for sustainable timber production, it is very popular with deer hunters, fisherman, bushwalkers, trail bike riders, horse riders, 4×4 drivers, birdwatchers, campers, nature lovers and those who just wish to go for a drive within 1½ hours of Melbourne.' - Wikipedia
The above statement might also help with your spatial interaction. But definitely mention the sustainable timber production (define sustainable ie. rate of production is not exceeded by rate of use) in relation to the vegetation map. If you don't have to link in the vegetation map bring up how and why the forrest is used (exercise/natural beauty and deer/fish according wikipedia).
Now. Climate and population graphs. For where/what? Visitors (population graph) and forrest (climate). I think I can predict some lovely spatial association with Spring and high visitor numbers, and Winter and low visitor numbers. Just talk about the relevance of data to the forest for whatever it is you're trying to make. If its about the origin or visitors you could do a sphere of influence as well. In my report I also compared visitor numbers on a nice day (25 degress/ sunny) and a terrible day (17 degrees/ rain) which linked climate to population very well.
Hope that helped. If you need anymore help feel free to ask. Not enough people do geography so it's good to see people aiming to beast it/do well.
Best of luck with the project.