Brussels  
Horta Museum - Art Nouveau architect.   www.hortamuseum.be   1-2 hour wander
Tour guide - We did a 4 hour a 'With Locals' private 3-4 tour private tour of city centre to get the feel. Pleased I did as I've never been here before.
Belga Queen - Brasserie city centre - busy, popular, We went here with a colleague of Richards... maybe not the place for a table for one tho... toilets cubicles have clear glass until you lock the doors... then they frost up...very confronting... can you really trust technology with your pants down? Now that's a good question. Mind you after 4 years in China where some cubicles have no doors at all... maybe it's status quo!
Gallerie du Rois - lovely quality arcade in city centre. 

Enjoyed walking Montgomery area where R's former boss now lives in his EMEA role. 
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Belgium Day trips
We had a car and drove to the following places but  never had a local guided tour which adds a different perspective. We were on a see-as-much-as-you-can-see-by-car trip. They were all worth going to but I think Leuven is my first pick. Richard found this link but maybe you will recognise the website...
https://europeupclose.com/article/5-belgian-towns-that-are-well-worth-visiting/
https://europeupclose.com/article/antwerp-a-city-of-history-and-riches/

Leuven - about 30ks from Brussels and amazing architecture... prettiest town hall on my travels so far is there I think. Uni town, vibrant. Please go here if you can. You won't be disappointed. Great feel about it.  

Ghent - great city. Our first day trip. About an hour northeast of Brussels

Aalst - I liked Aalst - lovely bell tower but smallish. Had an interesting new Gastro food bar cafe in main square between bell tower and the other church

Mechelen -  near Antwerp so another good place to go that s not too far.

Maastricht - Andre Rieu's home tome so had to go there for Mum. Liked it more than Richard. Good pedestrian areas and smart shops. Uni town.

Liege - another charming town - how do you rate one above another when they all have wonderful architecture?

Luxenbourg - great wander around here - quiet vibrant. Pleased I went as an easy tick for anther country but a good 2 hour drive!

Tyne Cot Cemetery near Ypres - we did this on the Ghent trip first day. Something I had to do for me... but I really had always wanted to go to Villers Bretonneaux in France 'one day' because of the Aussies there, but did not realise that Tyne Cot was the largest NZ war memorial for WW1 - still teary as I write this and  special visit for me. Then we drove to Dunkirk as it was so close and because we could. Pleased I made the effort again as I have not had the opportunity before. Maybe not the same journey for Richard but a good experience for both of us either way.