I've been on over 20 cruises. These 5 unconventional tips make my vacations more enjoyable. With over 20 cruises under my belt, I've picked up some unique tips for this form of travel. Jill Robbins After going on over 20 cruises in the last 10 years, I've picked up some unconventional tips. A roll of duct tape is easy enough to pack and comes in handy for small emergencies. I also like to book spa appointments on port days because they tend to be cheaper. I've been on over 20 cruises in the last decade, and always have another one on the horizon. Throughout the years, I've accumulated an array of helpful travel tips , but my favorite hacks go beyond the usual advice like downloading the cruise line's app and packing a lanyard. Here are five unconventional cruise tips I swear by that make life on board easier, more comfortable, and more cost-effective.  I always pack a roll of duct tape, which can fix almost everything. I once used duct tape to fix a broken pair of flip-flops.…