As for parks they too have group rates however, they arent so great for smaller groups like you so I think your best bet might be to plan your trips so you go to mostly parks of the same chain and buy a lot of "family" season passes.
2022 Trips: WDW, Sea World San Diego & Orlando, CP, KI, BGW, Bay Beach, Canobie Lake, Universal Orlando
As for sites, I use hotwire and priceline more than any of the others and always feel like I get a good deal.
I really don't think you are going to get any tours or anything but I could be wrong.
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