Exactly. You are near loads and loads of gorgeous places. just plan visits and if in-laws don't want to join you, that's up to them.
You can walk in the Surrey Hills or at Devil's Punchbowl - both areas of Outstanding Natural Beauty. As PP says - Alice Holt is lovely - join Go Ape there if you or your DC are up for that. There's Birdworld nearby too. Wild swim at Frencham.
Go to Guildford. You can hire kayaks and paddle down the River Wey. It is so beautiful. Or potter around the tiny lanes and shops, have lunch by the river, visit the castle.
Visit RHS Wisley gardens - fountains, hothouses, rockeries with waterfalls, amazing cherry blossom, azaleas and magnolias right now, lakes with gorgeous baby ducklings. They are stunning - you could spend a day there. Claremont Gardens are also beautiful.
Surrey is full of spectacular woodland walks, river tow paths, stunning heathland - all within a short drive of where you are. Climb Leith Hill or Box Hill.
If you like the arts, see what art shows are on at the Lightbox in Woking, and what plays, comedy gigs and music are on in Woking Halls, Guildford Yvonne Arnaud, G-Live, Electric Theatre, Boilerhouse.
If you like stately homes you can't move for them: Polesden Lacey, Painshill, Hampton Court. Jane Austen's home is very near you too.
There's a great winery at Denbeigh, fabulous car and aviation museum at Brooklands old car race track - you can go inside Concorde. Or go next door to Mercedes Benz and drive on the race track. If you like horse racing there are tracks at Epsom, Sandown, Kempton Park.
If the family likes theme parks, Alton Towers and Chessington World of Adventures are quite near.
From Aldershot or Farnham, it's less than 1.5 hours to London - you could be looking round the Tower, on the Eye, at the free Science, Natural History and British Museums, on a river cruise down to Greenwich.
Don't wait for family to get you going. Just make some plans.