Welcome mamabird! I had one obsessed with trains too and I also got a wee bit tired of it. grin My oldest also played this imaginary game about two of his friends at pre-school and we played that almost daily for about 3 years. He could bring it up and my eyes would begin to flutter with sleepiness. I definitely got very tired of that one.

Science museums, art parks, touring a nearby dairy, concerts in the park, even children's theater plays can all be appropriate for a 2 year old if they have any sort of interest or attention span for that kind of thing. Sporting events, air shows, etc. All of these we did with my DS10 when he was 2 or there abouts. He had an amazing attention span (longer than mine usually!) and would want to stay until the very end. Just go with your DS's interests and attention level and you can't go wrong. smile