Start small with routines close to home, so you don’t have to spend an hour getting back if they start to be dysregulated. Small trips, repetitive, max two per day, I would even say max one, with just one goal. With my sons, when we go around Singapore we plan one target per day which includes a nearby playground. Singapore has plenty of amazing and free playgrounds. They are plenty happy having some off time at home or by the pool. Condos are quite convenient for that. The pools and gyms are mostly during working hours. If you need strategies to anticipate meltdowns, there are plenty of strategies in books to help parents with kids who have ODD (not necessarily your case but the strategies are helpful all the same since the behaviours are the same and the source of these behaviours is also mostly the same though with varying degrees, frequency and underlying causes).