I recommend to take off the 2nd skin within 1 to 2 days. More information can be found in my "Tattoo Aftercare" tab.
Do not swim/submerge in a body of water with a fresh tattoo for up to a month. You will make yourself susceptible to an infection.
Same with swimming, please do not put sunscreen on the fresh tattoo for up to a month.
Wait a week or 2 weeks before doing any strenuous activities. The gym is rabid with bacteria and I do not recommend having your fresh tattoo anywhere near gym equipment.

It's best to ask your doctor and medical staff but I've been told that you can experience irritation in the tattooed area.