I wish I could provide guests $75 resort passes, but it would be just financially unfeasible with a hard budget (esp paying for a lot of it ourselves). When we were looking at resorts, I felt like we really took into consideration the costs for the guest (and everyone is in a different financial situation) to the best of our ability. Flying and staying in Mexico for guests is expensive, but hosting a wedding is very expensive too. Guest passes can easily be a budget blower. That said, we are spending the majority of our budget on providing great food which is something that *everyone* can enjoy, kwim?
Personally, I would not expect the bride/groom to purchase day passes if I was staying at another place b/c it was less expensive/free. If they could afford it and offered, great. If not, I wouldn't feel right putting that financial burden on them.