DH and I are headed on a trip to Hawaii for a friend's destination wedding next week and O will likely be the first or second day of the trip. Throughout the trip, the bride has planned some great activities, one of which is hiking to the top of a volcano/watching sunrise, etc. The volcano is 10,000ft elevation and there is a warning on the national park's website that women who may be pregnant should take caution at elevations. My assumption is that higher elevations could complicate things when you are much further along, but if I am in the 2ww, do you think there is any harm in strenuous hikes at higher elevations? Has anyone heard that this can impede implantation?