We’re in Aviemore a lot..here are my recommendations…
Bike hire from In Your Element at Inverdruie, there’s a big car park there, you can go off and explore Rothiemurchus Forest on well marked trails there.
Walk round Loch an Eilean.
Amazing takeaway pizza from Anderson’s in Boat of Garten
Nethy House cafe in Nethybridge is amazing - great walks in the woods there if it’s a less than lovely weather day
Highland wildlife park is great
La taverna as you come into town is a nice Italian
There are lots of activities at Rothiemurchus estate - rope course, pony trekking, quad bikes, mini land rovers
There is so much to do, it’s excellent
(and our terrible weather option is usually train to Inverness for lunch and a mooch round the shops)