On the 2-day tour “Winter Ice Cave Discover with Northern Lights Spotting,” visitors can enter ice caves in the Jökulsárlón Glacier with Hidden Iceland (Reykjavik, Iceland; phone +354 770 5733, www.hiddeniceland.is).

Day one is spent seeing waterfalls, a gorge and the Vatnajökull ice cap. On day 2, tour members hike up the glacier with guides seeking ice caves, which form anew each winter. (Ice caves can be dangerous but are more stable in winter than in warmer months.)...

In Canberra, southeastern Australia, the chance to sleep beside wild animal enclosures on the grounds of the National Zoo & Aquarium is given to overnight guests at the Jamala Wildlife Lodge (999 Lady Denman Dr., Canberra; phone +61 2 6287 8444, www.jamalawildlifelodge.com.au), located at the zoo.

Each of the luxurious “jungle bungalows” has floor-to-ceiling windows providing 24-hour views of either lions, tigers, sun bears or cheetahs.

For a visit from 1:30 p.m...

During high tide in Cornwall, southwestern England, visitors can ride horses in Mounts Bay, near St. Michael’s Mount, with Cornwall Swimming Horses (At The Peep Out, Long Rock, Penzance, Cornwall; phone +44 07460 856167, www.cornwallswimminghorses.co.uk).

All riding is bareback, and no experience is necessary. Upon meeting her horse, the rider is given a riding assessment, then decides whether to ride to the beach or meet her horse there. In the water, the rider may swim on or...