A circular walk of around 9 miles on country roads and mostly good paths, with the option to cut it short after about 6 miles and take the train from Bridge of Allan back to Dunblane. Some lovely scenery, weather permitting. Sections of the walk might be wet, because we live in Scotland.
Car parking is free on the East side of the former dual carriageway through the town, and also on the West side apart from the bit closest to the shops, which has parking meters.
Alternatively you could get the train to Dunblane if you wanted.
In theory there are public toilets in both Dunblane and Bridge of Allan, in practice there's no guarantee they'll be open though.
Coffee at the David Stirling memorial after about an hour, lunch in Bridge of Allan at the picnic tables or you could pop into a cafe.