The canals would be fine for exploring. Take a head torch and do The tunnel at Falkirk.
Loch Lomond also worth a look. Aldochlay is a good place to put in. Try not to upset the locals and park considerately. Sometimes it’s drop boats off and park elsewhere.
Take weather into account. Loch Lomond rescue boat seem to be returning a lot of folk who could have got a taxi from a plan b bail out point. In an inflatable you really want zero wind. Take flares. Mobile signal north of Luss is poor.
Loch Sween also very sheltered if you go further afield.
Strathclyde park is council run and needs RYA quals before they’ll let you on. Hogganfield used to be the home of glasgow schools sailing club, where my parents met! I exist because of a glacial land formation!