Thanks for the input! I'm not going to be hiking or doing anything stressful (just going for a wedding) and thankfully I already avoid caffeine and alcohol. I hope that makes a difference! I appreciate the feedback :)
I ended up in the emergency room. Make sure you take your atenolol. Stay hydrated - drink plenty of water. Get sleep. Avoid any stimulants - like caffeine, sudafed... Avoid alcohol that will cause dehydration. Aclimate slowly. I tried to go too fast, but my resting pulse was 120 with no exertion and I am in great health other than PACs that turned into SVTs. Take precautions but don't worry yourself into a higher pulse rate.
The altitude itself won't directly, but can indirectly. Unless you're planning hiking or rock climbing, I don't think you'll feel any different than when you're at sea level. I felt no difference when I visited out there years ago, and at the time, I lived at near sea level.