The farther your getaway place is from your home the less often you will go there. I suggest 2 hours max. If you plan on building, land cost is a tiny fraction of planning, development and construction. Remote properties can double construction costs. If the land you're looking at is not part of a subdivision development you should verify with the county whether you will have enough acreage to build. That will affect your use and future marketability.

When you have an area in mind look up nearby land/lot listings on Zillow for a quick idea of land costs and availability. Also check out the online county treasurer records of land/lot sales over the past year or two to know what different types of properties actually sell for. I'm looking to buy land near our cabin and we're sorting through 320 land sales records from the past two years. Once I remove all the outliers we can build a spreadsheet of comparables to determine a reasonable cost for what we're looking at.