Maybe we go against the grain, but we do burn pine in our fireplace insert and haven't had any problems. The pine has to be properly aged and should never comprise the bulk of what you are burning. Also, the temperatures of the fires that you burn make a difference in the amount of creosote that is built up. In order for the blower to kick on, the fireplace insert has to get pretty hot. Hot fires generally do not create a lot of creosote. The cooler fires are the ones that cause the problem. A cool fire is one in which you are trying to make the wood last as long as possible..like overnight.
We often use scraps of lumber that have been discarded to get the fires good and hot. When we order firewood from our usual supplier, we usually get mostly hardwoods with some (15% or so) pine pieces thrown in. We only buy wood that has been aged for at least a year and we usually order it 6 months before we need it, so it has an extra half year to further age.
As for the groundhogs... If you manage to kill one or see a dead one on the road, put it someplace that is highly visible (like outside one of their holes!). I killed a young one last year with a garden hoe and laid the carcass out on top of the compost pile for a few days. All of the adults avoided my yard for the rest of the season. This summer, they came back. I may have to try the cantaloupe in a trap in the spring.