Day 4 post-op, how much activity is safe?

I had my ACL reconstruction on Tuesday and I’m now 4 days post-op. I’ve got full leg extension and flexion is at about 90 degrees. I’ve been resting the last few days and have been getting about my flat on crutches. I’ve been keeping up with my pain medication and feeling pretty good!

I feel like I want to walk over to the coffee shop in the retail park over the road (300-400m) on my crutches - is this level of activity advised or should I be resting still today? I’m getting cabin fever but definitely don’t want to jeopardise my recovery!