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In the same boat with a 5 and 3 yo. Our plan is mayde do Alaska cruise (possibly Disney) soon, and do Yosemite the next year. First true international will be Iceland. Easy to get to, and a lot to see (horseback riding, northern lights, etc). Eventually (once oldest around 10-12) will do African safari, Galapagos, etc. Once the youngest gets to around 11-12, will start mixing in bigger european cities.