Most swimmers incorporate land training when swimming competitively. Since you will not have access to a pool on your holiday you will need to increase your workouts to maintain your fitness level. You can incorporate any type of cardio like running, cycling, and stair climbing. This helpful guide will show you various workouts and what to focus on during land training:

Dry Land Training
http://www.livestrong.com/article/458857-dry-land-training-swimmers/

To prevent injury many swimmers engage in various types of Yoga. The practice can be used to improve strength and flexibility. More importantly yoga balances your metal focus, helps during recovery from an intense swim or injury. Here is a great guide on Yoga for Swimmers:

Yoga for Swimmers
http://swim.isport.com/swimming-guides/yoga-for-swimmers


Let us know if we can assist further. Enjoy your holiday!