Sunken trampoline in landscaping, surrounded by mulch. Mulch is supposed to be a safer landing surface, since it has more give than grass on dirt in case the kids over-jump. It also blends into the garden area better.
If we could acquire the side of the house then would be ideal to have part grass (for the kids and trampoline) but then patio for grown ups. Have a look exactly where it's worth having the patio dependant on the sun. This could totally effect what we bother doing in the front garden. We'd be man not to have built in beds I think