Cycle rides with a trailer. DS seems a lot less obsessive outdoors and if we put a drink and a few books in the trailer he is happy to go out for an hour or so, especially if there is an ice cream stop.
We are checking out a local donkey sanctuary which does SN riding for children and their siblings.
We try and go for a walk or swimming each day. If we take the iPad DS will walk into town, sit in a cafe on his iPad for 20 minutes so we can have a coffee, and then he gets rewarded by getting the bus home
Train and bus journeys generally even if not really going anywhere just for the journey.
Anywhere with a miniature train. We may try mini roller coasters this year, he is very passive so likes anything with an adrenaline buzz. He loves water slides but it is easy to lose him in water parks so we need extra adults to put him on the top and stop him running off at the end. We have found one place with 2 slides side by side so I can watch him set off and then still get to the bottom of the slide in time to meet him before he runs off.
We have been known to walk into town let him go up and down the escalators and lifts and then come home 
.
Softplay for short bursts. Farms especially if they have a play barn.
Mainly he spends far too much time on the computer.
Our main problem is he is up so early that he tends to have got into a stimmy rut before the rest of us are getting going and I often feel I have failed to engage him properly before its even 8am and still have the whole day ahead.
He enjoys books and we have been taking photos of outings and making little books for him which he loves to read over and over. His favourite one has the traffic lights at the end of the road changing colour.
But we are lucky as his ABA runs 48 weeks per year so we only have a few weeks to fill, not the full 6.