Sometimes, I take TLM out to a playdate and she spends a whole hour wanting to sit on my lap; sometimes, her little friends visit us and she spends a whole hour trying to prevent them from getting their eager little hands on her precious toys. But when I take her to her friend's 3rd birthday party at one of those preschool-oriented indoor playgrounds, and I barely see her for 2 hours, that's what I call a good time.
Out of the 20 kids there, she knew three of them well (one of them being the birthday boy). So well, in fact, that as soon as they showed up she ran up to kiss them. Then she circled the kiddie town in her ride-on, stopping at my ankles every few laps to say hi and steal my snacks, came back in time to sing Happy Birthday and eat cake, and then I didn't see her again until we were all kicked out of the joint.
I don't know about you other parents, but that's the kind of playdate I like.