Okay - building on what floats your boat above:
Currour Halt has a nearby Youth Hostel set on the banks of Loch Ossian. http://www.syha.org.uk/hostels-in-scotland/highlands/loch-ossian.aspx
If you can beg or borrow some sleeping bags you could come in on the morning train, drop your kit (it’s only 30 mins down to the Loch) walk, stay the night and leave the next day. Much better than trying to push on and do it in one day. The Hostel is fab - no power bar lights, no hot water or showers, bring in your own food - attracts those that love wilderness so popular so book beds well ahead if you fancy it. The setting and quiet is amazing. The hills are not that near - longish walk-ins - so you would get much more out of it by spending the night there and could not be more different than Glasgow/Edinburgh.
Falkirk Wheel is okay but you know it is very modern not historical, right? You can book a trip on a canal boat which takes the wheel to change levels and when I went I wish I had done that as looked better than just watching the action. Recall it was pricey though compared to just watching. If you are going up that way there are a few nearby options including:
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Ruined royal palaces at Linlithgow (http://www.historic-scotland.gov.uk/propertyoverview?PropID=pl_199&PropName=Linlithgow%20Palace
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The model village at New Lanark (world heritage site) http://www.newlanark.org/index2.shtml
or
- The working steam railway at Bo’ness http://www.srps.org.uk/railway/ for starters.