I havent done much hill walking but Ben Lomond is very popular and not too difficult if taken from the Rowardennan side. Arrochar i think will be good too but i’ve only ever had the bike there rather than walked.
+1 for Crab Shakk, really good.
Also the Wee Curry Shop is really good too. Mother India is run by the same family and is also excellent (particularly the one on Westminster Terrace)
If you want ‘Scottish’ food then the Ubiquitius Chip on Ashton Lane or Number 16 on Byers Road are pretty good
For things to do then depends if you like art galleries and museums. If in the centre then goma (modern art gallery) is worth a visit. Sometimes the Lighthouse is depending what exhibition they have on. A tour of the art school is good, lovely building. There is also a small museum of religion next to the Cathedral (which is itself worth a visit) The biggest museum is in the west end at Kelvingrove and close by to this at Glasgow University is the Hunterian – there is a museum bit, which is closed at the moment for building work and also an art gallery in a different building. The museum of transport has recently opened fairly close by, but i’ve not been yet to see what it is like. All the museums and galleries are free.