DSis said she had a voucher for a free meal and would I like to go with her. I asked her when and she said any day so I said it will have to be the weekend. This is because I work all week and have the kids clubs in the evenings and we live about an hour away from each other so not realistic to do during the week. She booked the day off work herself but then when she tried to book the meal, she was told it was only valid for weekdays. As she already had the day off booked, we both said we should still do something on the day instead of the meal. She is set on an activity that will cost me a lot as I'd have to pay for myself and the 2 kids, plus fuel to get there. She would just be paying for herself so easier for her to justify the cost. It's an activity she enjoys and the kids would enjoy but I would not as it very physical and I will struggle so I told her I'd just begrudge paying so much for something I wouldn't enjoy and suggested a cheaper day out such as a museum and walk around the city centre where there is plenty to see and do at low cost plus no time restriction. She currently doesn't have a car but lives right next to the city centre so this would work well for her to get there and I would only have to drive to one place and back. The activity she wants to do is further out and she's said she can get a lift there but not back, so I feel like I'll also be expected to take her home, which would be in the opposite direction for me. I've tried to explain that I don't want to do it but she just keeps sending me different deals for the same activity, mostly in locations she can't get home from or for prices I'm not willing to pay. AIBU to say she originally invited me for a free meal and, while I don't mind spending some money, I'm not spending loads on a day out I won't even enjoy and if she doesn't want to do something else then we should just forget it?