A hike to the top of Yosemite Falls is among the best the park has to offer.

ankopsu Article on Yosemite National Park

Make a visit to the Staropramen beer factory, Staropramen is a beer made in Prague and you can tour the factory. It is close by the metro station Andel.

Mike Contiki Article on Prague

If you are doing a time out tour (staying in hotels), a travel iron/hairdryer will come in handy as many european hotels do not provide these facilities.

Vicki - Contiki Staff, Europe Article on Suggested packing list - Europe - Summer