No, there's something wrong there. Just checked it for you, every hour (at XX:51) there is a train going to De Panne that takes you to Koksijde (takes 1h14).
Maybe you didn't select the right train station in Ghent? (Gent-Sint-Pieters is the "main train station" that you need to select)
If you're both cyclists, it might be interesting to try some of the
cobblestone sections (Paddestraat, Kerkgate,..) and
hills (Oude Kwaremont, Koppenberg,...) from the Tour of Flanders, but then you'll need to cycle a bit to get to the Zwalm-Oudenaarde-Zottegem area...Hell, if you're really up for it you can ride until Geraardsbergen and do the Muur as well (and have a "Mattetaart" when you're in town

)
Belgium is a culinary country, man! If you have money to spend (and at a retirement age I am assuming you do

), the "best" Belgium restaurant is also pretty close to Oudenaarde ("Hof van Cleve")...although *SPOILER ALERT* that takes money spending to another level

... but if you are looking for more affordable great quality in Ghent itself, there is e.g. "Publiek" (combines dishes with beer), "De Vitrine", "J.E.F.", "Balls & Glory",... (and there are 3 Michelin-star restaurants in Ghent itself as well, but again... that comes with a higher price tag)